I think that we are overlooking one very important part of the AI equation. One I have not heard to much about. With out curiosity will AI ever evolve? We can make the perfect Milk Crate making robot, we have tool to build the perfect milk crate from 3D printers, Soon all the milk crates will look the same, AI has determined the most optimum design parameters for the milk crate right down to the color.
Many times people have heard the phrase if it works why change it?, or something similar. It is our curiosity that drives change, our ability to ask What if. Automation may be better and faster and more precise than humans, but will it ever ask What if?
I'm one of those don't fear AI replacement, AI is created by people, people are flawed in their thought processes, so I really don't see there ever being a perfect machine, it may look and act in a perfect manner, but will it ever grow through curiosity? That automated combine harvester will never ask itself what is on the other side of that hill.