When Zenimax was acquired, it was coming off a couple of failed fallout games, a meh ESO and delayed Elder scrolls 6. Similarly, Activision-Blizzard has been in the midst of COD and Overwatch losing their gaming monopoly to Fortnite, Blizzard failing to create a good game for about 5 years and the big workplace lawsuit.
It feels like Microsoft is taking on the challenge of reviving these companies back to being the powerhouses of old. In that sense it is a big challenge and not as simple as just buying the future of gaming.
If they wanted to do that, they'd probably try to buy Naughty Dog or Fortnite.
It's like acquiring Fiat Chrysler or General motors. Still big names, but clearly not the 'brands of the decade'. You wouldn't buy them to form a monopoly. You'd buy them to revive the brand.
