Honestly, I don't even care about exclusives. I buy into Xbox because I like the controller, because I have an existing library and also because I like Game Pass and the general way the services work. Like, I know that conceptually, exclusives matter, hell, I have my PS5 because of exclusives, but ultimately as long as Game Pass is a thing that's providing me significant value, I think I'm going to keep buying Xbox systems.
I mean hell, with my play time on both my Xbox and my Playstation, first party exclusives have barely been any of my play time. Most of my play time on both systems have been multiplatform games that I could have easily played on other systems at the time.
I think that when they're starting this pivot they'll try to do about a year or so of timed exclusivity, and then have multiplayer/GAAS games be day and date as time goes on.
I think Hellblade 2 will be a game to stay exclusive though. It's basically the video game version of an art house movie, even if it's successful on Xbox it's probably not going to make much money releasing later on PlayStation, all while still providing some marketing to Game Pass and Xbox. But something like Indiana Jones probably one year out from launch. Some games will be different though, like for Starfield I personally don't see that launching on PS5 until development on the game is basically done, and it and similar games would just launch as "Starfield: Complete Edition" on PS5 and into Game Pass or something, similar to Grounded.
But honestly I'm still not sure that MS is going to be going fully multiplatform. Like I'm sure they're evaluating their options and that realistically I should assume that they will, but if I had to hedge my bets I'd say that the multiplatform initiative is going to be focusing more on the library of GAAS games releasing everywhere they realistically can while not significantly changing their strategy with single-player exclusives. Some games like Hi-Fi Rush, Blade, Starfield, The Outer Worlds 2 and smaller games will arrive on other platforms here and there but ultimately I imagine they're still going to have *some* exclusives even if only to help sell Game Pass