I wonder if this will trigger any antitrust lawsuits. I know Microsoft isn't that of the 90's but it seems like the political situation is ripe for politicians to go after "big tech" and this is a pretty major acquisition that will help Xbox be the dominant player in terms of content.
Unless politicians make major changes to the anti-trust law its unlikely to be effective. And doing so would require major action in congress.
The president could use non anti-trust actions as well of course. But rather unlikely.