Someone explain this techno nerd obsession with replacing people with robots, I just don't get it.
There's a general and a specific answer to that question:
General: If it is going to happen, it is much better to be the person doing it than the person it is done to, so if it can happen, best assume it will.
Specific: Almost all of Uber's problems spring from the fact that cabs currently need to have drivers.
These points of view do not consider what effects this will have on society in general. Capitalism does not do that.
Of course, there are also people who simply like the technical challenge, but they are generally not financing themselves in this pursuit.