if buying Activision after buying a dozen studios and one publisher stands up to scrutiny what argument would stop MS from buying Ubisoft, EA, take two, SE....Because the governments don't care about the number of acquisitions, they care about overall market share.
Buying up more of the market gets harder to do.
MS doesn't need to buy up all the development studios to kill playstation. MS only needs to starve ps of enough content to appear non-viable to gamers and the entire community implodes. no one is going to buy a ps for just Sony first party and indies.Plenty of people would.
There are also lots of markets that wouldn't care about Xbox regardless.
I don't think Sony is as fragile as they used to be /as you think they are.
They're not as strong independently as Nintendo, but they are a lot closer than they used to be.