I dont think sony will buy studios that are already making games exclusively for playstation like housmarque, bluepoint and insomniac. Sony already has enough studios that can deliver story based single player games, VR is also covered. Right now sony only needs studio that can deliver on Multiplayer games and arcade racers, Sony needs somebody who can revive Socom, Warhawk and twisted metal series.
My wishful thinking is Sony should buy only one studio BUNGIE, I know they dont wanna be first party but if insomniac is in the mix then i would prefer bungie.
Also I strongly feel sony will not buy any major studios, but instead several exclusive gaming deals, and i think major one could be GTA6.