Your proposition ultimately comes down to this: You can't imagine what we'll be doing next.

No, my proposition comes down to this:

In short, people are rapidly losing a comparative advantage versus machines.

What comparative advantage will people still have? How big is that market? How many people likely to be out of work can fill that market?

Really good robotic hookers and "escorts" are a ways off. There will be work there for a while, but not everyone would be in demand in that market.

There's no reason every person has to have economically viable capabilities, particularly in a regulated economy where there is a minimum cost threshold through regulations. Some people now, don't. Babies don't.