There was definitely a long-term trend of computer shrinking. Room->closet->desk->lap->pocket, but I agree that future interaction models look completely different, and there isn't an obvious next step.
Realistically I think the future is already here with a proliferation of specialized mobile devices. This is why Apple took away the headphone jack: so they could sell AirPods. OP was right in the sense that glasses will be coming into this model, I just differ as to how central they’ll be to the future computing environment.
I’m hoping that there will be a bit of a backlash to the Saasification of consumer tech, with its implications on privacy/control. Though I have to say I’m not very optimistic.