Shall we predict next Pokemon game bases on the starters that appeared in recent games? It might mean shit but might be interesting.

XY gave us Kalos and Kanto starters
Then year later ORAS gave us Hoenn starters and Johto, Sinnoh and Unova starters in the post game

Now SM gave us Alola starters with Johto starters through the QR codes and Unova final stages by the same method. There are also Charizard being the fly mon, mega stones for kanto starters and Ash-Greninja via demo but those hardly count since they're all extra cameo and items and Ash-Greninja cant even be bred

So if we'd assume GF wants to give us all starters withing gen 7 then next game should be
-Sinnoh remakes with Kanto, Hoenn and Kalos starters post game
-Kalos return with similar setting as XY (so Kalos+Kanto starters main game and Hoenn+Sinnoh starters post game) or Kalos-Alola game where rest starters are post game anyway
-Kanto game with other starters being post game
The only iffy thing about Kanto game is the recent RBY VC connection with SM where GF clearly intended for people to sent their Kanto starters to SM (hence why Kanto starters mega stones are in SM) so that makes Kanto game a bit less likely

2nd Alola game with extra 4 pairs of starters added to the 3 existing ones just wouldnt make much sense