Obsolescence

I find myself wondering what we'll do as a society when we've automated every job that currently requires a human. Hearing reports that computers are now able to write clean essays and papers is somewhat discouraging for me, personally, and brought this question into my head.

Sooner or later, computers will be designing objects, and then assembling them via robots, with little or no human intervention. Assuming there is no machine revolution, what will people do in a world where there are no jobs because machines do all of the work.

What happens when all vehicles on land, in the sea, and in the air have automatic pilots?

What happens when a computer can diagnose a medical condition more quickly, more accurately, and more reliably than a human doctor? When it can prescribe the best medications and control a robot to perform the best procedures?

What happens when all manufacturing is done by robots?

What happens when humans are no longer needed for anything?

I can only imagine that the wealth disparity that exists now will become far worse. It seems likely that the owners of the machines (and therefore all of the wealth and resources) will represent a tiny portion of the population. What will become of everyone else?

A machine revolution might not even be necessary for a vast depopulation event.