DarkPrinceAlucard I suspect at least
one reason why shows like
Victory Gundam,
After War Gundam X, &
Turn A Gundam aren't likely to be dubbed now is due to them not being recent.
How new a show is has never stopped Toonami from dubbing certain shows (and airing certain movies) before, but it seems to be a different case with Gundam shows on Toonami. They also never aired
Gundam 00 on Toonami due to it already being dubbed for the Sci-Fi channel block ("Ani-Mondays") back in 2009.
This still isn't dubbing, but they did release Blu-Ray Collections of Victory & Turn A with English subtitles.
I still don't know why Toonami didn't try dubbing
Gundam AGE or
Reconguista in G...
Too goofy for them, I guess? (Although the former did receive an English dub from "Nozomi" for its own Blu-Ray release.)
I really have no clue why Sunrise refuses to license certain Gundam shows for dubbing.
I can clarify some things here regarding the frustrating dubbing situation with Gundam. This will be a bit of paraphrasing here (and a touch of speculation), but it'll give you the gist. So what happened was, in the late '90s, Sunrise/Bandai decided to bring Gundam over to the US and ride the newfangled anime train with recently imported hits like Akira, Ghost in the Shell, Ninja Scroll, and Macross Plus. They did this by releasing Mobile Suit Gundam 0079 Movie Trilogy, Gundam 0080, and Gundam 0083 both subbed and dubbed under the label "Anime Village." This is where the solid (even memorable) 0080 and 0083 English dubs come from that still exist today. The Movie Trilogy, however, is a strange thing. It, too, was released subbed and dubbed, but for whatever reason, the dub didn't turn out as well as 0080 and 0083's did. As a result, that dub was buried, relegated to VHS only, and therefore all subsequent DVDs and Blu-rays have been subtitled only for that entry of the franchise...
Anyway, fast-forward to 2000 and it's decided that a second, more concerted push will be made to get Gundam rolling in the US. A deal is made between Cartoon Network, Sunrise/Bandai, and other entities to launch Gundam Wing big-time in the US. We therefore get that dubbed and it turns out to be a huge success. But then we get a problem. Sunrise/Bandai are happy that Wing is successful, but really feel that Americans need to get invested in Universal Century, since it has the most entries at the time (G, X, and Turn-A being the outliers). They believe that if Americans liked Wing, made in 1995, they'll love Gundam 0079, made in 1979. So, they do the first of what will be many remasterings of said TV series (not the previously released Movie Trilogy), and give in a first-ever English dub by the same company that did Gundam Wing's dub. At the same time, seemingly to soften the blow of the more dated visuals, they dub, release, and air simultaneously the 1996 Gundam 08th MS Team OVA side-story that takes place concurrently with this TV series (roughly post ep.10). As I understand it, 08th MS Team does okay, but Gundam 0079 tanks pretty badly, and as real-life conflict/war dominates the airwaves in late 2001, it's decided that Gundam 0079 should be taken off the normal TV schedule. (I hear it finished up its run in late-night at some point.) Bottom line is, 0079 didn't hit the way Sunrise/Bandai hoped it would. From late 2001 through 2002, the previously dubbed 0080 and 0083 were originally intended to air on Toonami's afternoon schedule, but both were moved to late night, limiting their exposure some.
In perhaps an effort to expand Gundam's audience base, the live-action G-Saviour was released next in the US (which already had English-speaking actors in it). That didn't find much of an audience, either. But seemingly intent on making the animated U.C. sell in the US as much as Wing, Char's Counterattack was the next to get dubbed, since it was considered a prestige movie in the franchise. At this point, early 2003, it must have been sinking in that Wing's success was separate from what U.C. was offering, because at last G-Gundam was released, which had more elements that would appeal to people just coming off Wing, and it was a modest success. It wasn't Wing level, but it did pretty well. (This time the dub is done by the team that dubbed Zoids.) And I think another reason it was chosen was because there was a lot of merchandise associated with this series. Unfortunately...Bandai overproduced the merchandise for it, and that led to a glut of product that did not sell, which wasn't great for the bottom line. At the end of the day, the hope was to sell toys/model kits in the US like in Japan.
So now we're basically in at a critical crossroads for Gundam. Give or take a month, you have to understand that by the time Gundam Wing aired in the US, Gundam had basically grinded to a halt in Japan. Between roughly April 2000 and October 2002 there was no new Gundam in Japan. Turn-A Gundam had evidently not done well, after Gundam X had not done well, so there was a reassessment going on about the franchise. This is the time that Wing was a hit in the US, though, so we had time to catch up with dubbing stuff...until we didn't. Japan had just finished releasing Gundam SEED, and had been a mega-hit that revived Gundam. So, by 2004, rather than follow-up G-Gundam with Gundam X (which looks A LOT like Wing and feels a bit like a mashup of Wing, G, and 0079) or something else, it was decided to jump ahead and dub Gundam SEED. As I understand it, Gundam SEED was a hit in Canada on TV. In the US, it didn't do so well on TV, but still garnered a pretty sizable fandom anyway. During this time, Sunrise/Bandai still pushed ahead with U.C. by dubbing F-91 and Zeta Gundam. (Neither would see a TV release, and the latter was originally only available as a $200 premium box set, IIRC). They would go on to dub Gundam SEED Destiny...but it wouldn't even get an airing in the US; though, again, it did well in Canada, I believe.
At this point, any Gundam made before SEED getting a dub was basically out of the question. Because SEED begot SEED Destiny, and from there, Gundam 00 emerged.
Gundam 00 was another effort to relaunch Gundam big in the US, this time using the Sci-Fi/SyFy Channel as the conduit in late 2008. Again, it couldn't replicate Gundam Wing's success. (Partially because Sci-Fi/SyFy didn't have the same kind of audience as Cartoon Network, I believe). But this was likely done as well because Cartoon Network's Toonami block was defunct by this point. (As it was, SEED had aired on a fading one-night-a-week-version of Toonami, and was even moved off that, presumably due to low ratings.)
This was basically the nail in the coffin. Dubbing Gundam wasn't very profitable overall. And then, Bandai Entertainment, which supervised the dubbing and release of Gundam in the US, decided to pull its operations out of the US and back to Japan during the anime market crash of the late 2000s.
So how is it that we are getting some dubs again? Two things happened. Right around or just after the time that Bandai closed shop in the US, they had a mega-hit with Gundam Unicorn, which was dubbed as a prestige project and released overseas originally via paid streaming services like the Playstation Network or via expensive Blu-ray imports. NY AV Post did the dub, and they became Bandai's new go-to dubbers.
After this, a small but respected and connected company Right Stuf (who owns Nozomi), cut a deal to handle distribution of Gundam in the US. They began to re-release older Gundams, and release for the first time some older and newer Gundams (sub-only, if no dub was made). But they have nothing to do with dubbing, and they don't have their own in-house dubbing studio. So the dubs you see on AGE and some for the Build Fighters stuff comes from an overseas (I think Malaysian?) English dub house, which is made for satellite TV services or in-flight viewing in Asia. Generally they are considered to be lesser-quality dubs, so they're not meant to be seen in native English-speaking countries, but Nozomi puts them on as a bonus feature to help those who demand a dub.
Because of all this, it's tragically unlikely series like Gundam X will ever get dubbed, though I've campaigned for it to happen in the past, and with the overseas Blu-ray release about a year or two away, now's maybe the best chance it has of happening. Curiously, Gundam SEED and Gundam SEED Destiny will get REDUBBED within the next year or so with a new cast to help release the revised/recut footage of the Blu-ray adaptations of those series.
Oh, Iron-Blooded Orphans got a dub because Funimation cut a deal to have it not go to Nozomi but to them. Iron-Blooded Orphans was expected to be the next Gundam Wing in the US...but again, even though it got a dub and a TV release and a streaming release, that's not something easily replicated. I have a feeling IBO underperformed.
Reconguista in G was avoided because it was considered a mess/flop, as I understand it. AGE didn't get a more established dub because of similar reasons, I think. The strange thing is why there hasn't been a more concerted effort to get the Build Fighters stuff a more established dub and onto children's television overseas. I think I heard a rumor that the newest one, Divers, might get a real dub, but not sure.
At the end of the day, Bandai/Sunrise decides what gets dubbed and who dubs it. Toonami has little to do with it, as they just air and promote things.
Sadly, if Gundam Wing had been followed up immediately with both G-Gundam and Gundam X, it could have built much better momentum in the US. But that ship has now sailed. Apparently there is some prejudice about Gundam X in Japan because of how it underperformed and had to be cut down from 49 episodes to 39 episodes late in development. I think it was a victim of Gundam fatigue, though, because it's a really good series (and would have been even better if it had gotten ten more episodes as originally planned. Man, I'm disappointed it didn't get ten more episodes). But that initial perception is why Japan probably didn't offer it to the US...ever. It took Nozomi to get that one over here just a few years ago. I think at the time of Gundam Wing's release, you go with Gundam Wing, Gundam X, G-Gundam, 08th MS Team, 0083, 0080 as your playbook. And then you assess where things are by then.