If someone else replaces all workers with robots first instead, what will Bezos do then?

What you are describing is a political problem, not one for entrepreneurs. IMO the solution would be a form of UBI that we can smoothly increase as automation in fact removes jobs or lowers wages. I'd like to see that start ASAP, but OTOH we are still close to record-low unemployment and the last years saw the largest wage increases at the lower end in decades.