They're building the Netflix of games with the catalogue to match. Seems like short and mid term, they're focused on owning as many brands/IP as possible, and predictably, efficiently releasing solid games that don't rock the boat too much. See Gears Of War, Forza and Halo. With Bethesda and ActiBlizz, they have enough IP under them to release 3-4 okay games every year, which will make Game Pass a good value proposition when third party support eventually dies out.
This. It’s similar to Netflix realizing they need to own as much content as possible to retain and attract subscribers and keep fat margins. GamePass is where the money is. Once they have your credit card the friction to up sell you is dramatically lowered.