As to Sonys future acquisitions:
I think Sony's long-term plan should be to open at least one new first party studio within Japan headed by an industry vet like Ueda, Toyama, etc. + acquiring one big publisher (Square Enix). With Polyphony and Asobi, this would keep them extremely relevant within Japan, and they could revive several legacy IPs. The only thing I worry about is the can of worms that is a Square Enix acquisition. I don't want to see companies like Tencent and Microsoft scrambling to acquire Sega or Capcom as a result. I guess the only silver lining with the ABK acquisition is it could prevent Microsoft from trying to set up shop in Japan. If Ryan/Hulst don't make moves in Asia within the next year, I want them gone; but ideally, Sony should just promote someone to oversee development of SIE East (maybe someone within Asobi).
As for western studios, Sony is lacking two things, WRPGs and FPS games. Obviously Deviation is a target, but I'm unsure about them after the Jason Blundell departure (need to see what their game looks like first). My other target for WRPGs would be CDPR (I know this is controversial). After playing Cyberpunk post-patch, I truly believe this IP has GTA levels of hype and potential. It would be a massive get. However, after the PS Store removal drama, it's probably a bit unrealistic. I also think Tencent would outbid Sony if it came to it.
Call it hindsight bias, but Sony truly screwed up by not acquiring From Software after seeing the success of Dark Souls, and two, not acquiring CDPR before they went public (~40% of approx. 30 million Witcher 3 sales were on PS4).