We're never NOT gonna see Seed/Destiny, 00, and Z are we?
Seed/Destiny will be gone by the next one. I wouldn't be surprised if 00 was gone too and probably Zeta. Since this is a re-use, they might as well keep the popular ones where the sprites are already done. When it's time to actually make all new sprites, those series are finally getting kicked.
The only series that will probably still be in the next licensed 2d SRW will be Gundam Unicorn. That's got at least another title in it before they axe it for a while. They'll do the Re: 0096 or Manga version or something to keep it in.
But yeah, if the next one has Iron-Blood Orphans, Origin and Thunderbolt and maybe Unicorn, I would expect that would be all the Gundam new entries for one game unless they put G-Reco in. G-Reco not being in V and not being popular makes me a little concerned they're going to treat it like AGE and stick G-Reco in the next handheld SRW
Also if it makes you happy, you can hope that SEED and 00 and Zeta will be units only and not have any plot in V. There's way too many series to do all those plots. They usually do about 7-8 plots per game and there's like 7 new series. Although I guess 00's plot is like a 2 map thing and all the sprites are already there, so they'll probably throw the ELS in again yawnnn