I used to think that "AI operating in meatspace" was going to remain a tough problem for a long time, but seeing the dramatic developments in robotics over the last 2 years, it's pretty clear that's not going to be the case.

As the masses fade into permanent unemployment, this will likely coincide with (and be partially caused by) a corresponding proliferation in intelligent humanoid robots.

At a certain point, "turning on them" becomes physically impossible.