When I read the title, I thought this was going to be guess which major game company MS buys in 2025.
As for the proper OP, I can't do all studios. But I would like some studios to focus on certain games for sure.
Blizzard- World of Warcraft 2, the key here is some sort of MMO innovation in a fantasy setting.
Rare- Banjo 3, A proper Banjo 3 would be amazing with the correct development.
Bethesda- Fallout 5, since ES6 took so long, it is already time for Fallout 5.