Here is a wild one: Valve
Think about it this way, Valve has industry leading VR and a storefront. Sony needs all the VR they can get to fight off Facebook and their VR which is rapidly growing to become the most popular vr headset. Getting Valve to make console exclusive VR titles for PSVR2 would be a great selling point for the headset, and Valve would actually get off their ass and make games. When Valve makes something it's always a banger so they've got talent on their side too. Steam being integrated with Playstation store could help tremendously with their PC porting plans, and to top it off, they could bite into MS's bread and butter: windows.
Valve have been making steamos to get away from Windows for a while now, and with the backing of Sony, not only steamos but Linux as a whole could rise up as an operating system. They could bundle steamos with more gaming PCs and overtake windows in market share. If you attack MS's main source of revenue, not only Xbox would come crumbling down but MS as well, it's a genius strategy.
This is all a little fantasy I concocted in my head though and i doubt Valve would sell since they're a private company. And I have 0 idea what Sony would really do with Valve. Frankly I don't even want something like this, industry consolidation and exclusives and all. It'd be a wild ride if it did happen though