For Sony, just to continue my journey on this subject, here are my thoughts now, which have evolved over time:
S-E continues to look like a smart move, though increasingly less so over time. Three of their big plusses were supposed to be the western studios and IP, which fit well with Playstation, the traditional big 2 JRPGs and the live service games. Now the western studios are just plain gone, the bigger of the two JRPG franchises just had a PS-backed "underperformance" (and Forspoken too...) and even the GaaS, gatcha and MMO shit took a beating this year. So yeah, its a lot less an amazing target than it was a little over a year ago.
New target: The good parts of Sega. Sega is, and has for many years, been poorly run and their current "Super Game" strategy, to me, sounds like a pre-destined train-wreck. Maybe even a big enough one to cause bankruptcy/sale of assets. Specifically, Sony should go after RGG Studio. This is the good part of Sega, RGG/Yakuza fits, to me, what you think of when you think of Playstation titles in the early 2000s -the golden era- and they really crank titles out too. Atlas would also be another good pick up, for anyone. As to the rest of Sega, Sonic team can go to any JP publisher, the arcade stuff to Capcom/Namco/Konami and the European stuff to anyone who wants to sell PC GaaS titles.
Also possible: The usual grab bag of "good" independent large western studios. CDPR, IO, Gearbox, cast-offs from Epic, possibly just to be absorbed into the existing Insomniac NC team. I think that Amazon and, if neccissary, MS would out-compete them for the CD/E unit if that goes up for sale.
And thowing some small names out there: What about Linden Labs, Cyan Worlds, Jake Solomon's yet-to-be launched studio, Starbreeze Studios (Payday, currently owned by Embracer,) Good Feel (Yarn/Wool games with Nintendo,) Sumo Digital Newcastle (VR team, at least commission a game from them) or Kamiya's upcoming new studio?
And just to be clear here, I'm not saying all of that. You get 1, at most maybe 2.