Microsoft thinks there is an audience here too, given Project xCloud.

Maybe there isn't enough high speed internet deployed in the world, but there certainly are a lot of devices capable of streaming given how many people already have an Android or iOS device on them at all times. Both of which support Bluetooth and most modern game controllers. Some of which have better screens than most people have at home. Some of which have better specs than, as just one interesting example, Nintendo's Switch.