It's not just game pass though. Microsoft has flat out said they are moving towards streaming. They are also doing things like making Xbox live a service on the Nintendo Switch, iOS and Android. Game Pass the way it is today is just an indicator into how things will be.

Microsoft has made clear that they want Xbox to be a platform independent of the physical box they sell to people. They are 100% going in the direction of Stadia. The big question is how they are going to do it in regards to their next console.