> But you have to admit, there's going to be riots in the streets when it's no longer economical to pay a human to drive a trunk/taxi.

Why would there be riots in the streets for self-driving cars in particular? Like when there were riots for the assembly-line or the tractor? There will be riots for education, healthcare and opportunity - and probably there should be. Technological progress of civilization should be something more meaningful than the rich getting richer.