I doubt that. Gens 4 and 5 have nine Legendaries respectively, while Gen 6 has 3 Legendaries and 3 Mythicals, some with alternate forms which could provoke some interesting Special Research quests for Zygarde and Hoopa specifically. Gen 6 would likely been dominated by returning Legendaries, particularly from Gens 4 and 5 to have Shinies. Gen 7 has 7 Legendaries and 3 Mythicals. If anything, it will likely be too crowded.
This is a conversation for another thread regarding the future, so I say if you want to talk about that more, we can start a new topic about it. I don’t want to derail this topic again.
EDIT: I started one here: Timetable of Future Generation Releases (Supposition and Speculation)