Regarding potential acquisitions, please remember they don't plan them for the short term, pretty likely because they want to wait for the cash from selling their banks parts and to complete the related payments of the previous acquisitions, which they are still paying.
Such payments of previous acquisitions, combined with the unexpected rise of the costs of components (+related stuff like shipments, inflation) caused them a profits decrease, which I assume they'll want to address while waiting for the banks cash before continuing making (not tiny) acquisitions.
I think Arrowhead and Ballistic Moon -if the Until Dawn remake and the sequel I'd bet they are codeveloping with Firesprite (who has many several Supermassive devs) ends being a successful project- are maybe the most likely candidates because of their very long relationship (Balllistic Moon devs are mostly former Supermassive devs, who made a lot Supermassive devs).
Regarding bigger acquisitions of cases like Koei Tecmo, Arc System Works, Capcom, FromSoft/Kadokawa, Square Enix, Sega, Bandai Namco, etc. could be more complex because of higher prices, having some of them on some markets where Sony may not be interesting (like pachinko/pachislo, manga/books/magazines, etc), some of them being public companies (so maybe having shareholders who may not want to sell, etc). But hey, if they do it I'd like it.
Regarding acquisitions vs 3P exclusivity deals, I think it isn't something they have to choose between one thing of the other. They can continue doing both, which is what I think they'll continue doing going forward.
In games first party doesn't mean owned or developed by the platform owner. It means published by the platform owner. Meaning, 2nd party games like Wild Arms are also 1st party games.
2nd party game = 1st party game with a lead dev studio not owned by the platform holder.
Sony teams apparently working on multiple IPs:
- Insomniac: Venom, Wolverine, Spider-Man, Ratchet, and soon X-Men and new IP
- Bungie: Destiny, Marathon, Matter and pretty likely something else
- Naugthy Dog: 2/3 new single player games, it's fair to assume each from a different IP
- Firesprite: working in minimum a MP game with on-foot and vehicle combat and a horror adventure
- SSM: GoW + new IP
- Team Asobi: next game + multiple prototypes being incubated
- XDEV (2nd party): just released Helldivers 2 and Rise of the Ronin plus have Stellar Blade, Death Stranding 2, Physint, Convallaria, Lost Soul Aside and probably more
- Nixxes: support team who makes PC ports for different IPs
- PS Studios Creative Arts (San Diego, San Mateo, Malaysia, etc): internal global teams (include Production, Visual, Audio etc teams) who works in most of their 1st and 2nd party games.
Lead PS Studios working on -as far as we know- multiple games of the same IP:
- Polyphony: GT7 + GT8
- Guerrilla: Horizon 3 + Horizon Online
PS Studios teams apparently working only in a single game at the same time:
- Media Molecule
- Housemarque
- Firewalk
- Haven
- Bend
- San Diego
- Bluepoint (support team)
- Fabrik (support team, merged into Firesprite)
- Valkyrie (support team)