I don't see how Marx's ideas stand up in a world where automation and AI supplies most of the labor. With a UBI, there wouldn't be anybody obligated to work or starve. People would work because they wanted more income, better food, nice cars, etc.

It kind of takes the fire out of the revolutionaries if they can just coast by on the UBI. Maybe grow a little pot, raise a few chickens and vegetables. Sounds like a peasant's ideal retirement to me. Why would he want to shake up the system?