> keep their margins high and charge only slightly below what a car driven by a person costs
So you mean like, "the whole point of self-driving taxis is that they are cheaper to run, ... and that's how they will compete?"
You're trying to convince yourself too hard that you disagree with the previous comment.
There will probably be a bit of both: using the margin to seriously undercut the taxis and ubers in order to drive them out, and then raise prices.