I normally get gamepass when I see a new release coming out that I want to play but my not want to pay full price for. Last I used it for was Starfield. I'll probably renew it again when Persona 3 comes out next year.
Regarding the future of gaming, I think it is a really good way for people to play a lot of different games without having to buy them indivdually. You can check out their library on line, if there is a lot you would want to play I would say it is worth it for a few months.