Are you seriously asking what’s left for PlayStation? Remember PlayStation is owned by Sony which has Games, Movies and Music studios with substantially more Game/entertainment intellectual property than Microsoft.
This acquisition may look like Microsoft is getting ahead but on the contrary they are still playing catch up with Sony (2nd) and Tencent (1st) in term of owning Game Studios.
Microsoft is just now stepping on the big three Podium as the 3rd largest publisher.
The problem Sony will have is how they are going to handle being undercut for a long time , game pass is still cheap for what it is , and MS doesn't seem to be bothered by using its Azure and Enterprise warchest to play at a loss , same as Facebook does not care to do the same on their Oculus HW , those titans are using money to breakdown the competition , Sony might seem like a big deal in gaming which they are , but they are 20x smaller then MS , with a MUCH worse money flow overall , MS are printing money in the tens of billions each quarter.
The interesting question is , can MS show a profit out of using all the cash on gaming , they spent over 80BB this year on studios , that's a LOT of money that wont be recouped easily just by selling games , so the logical thing to assume is that they know they are going to lose money but also weaken the competition , in the end of the day , if Sony is hurting , Xbox is winning.
I wont be surprised to see MS going after TakeTwo to get GTA , it has a mega buying power (ppl will buy Xbox just for this game) and it has a big online footprint , which MS loves and its part of this disgusting new trend buzz of "Metaverse".
One thing to note about big studios being bought out , they almost always breakdown and the employees spin off to do their own thing , if the developers notice this trend , as they did in SW and HW , where big companies buy startups/smaller companies on a regular bases , you will see the top talent leave , start their own , and then sell for a profit , interesting to see where the industry goes from here.