I think the idea is that Americans will abandon personal car ownership for the use of robo taxi. I don't see this being an affordable or convenient option for most of the country.
I can drive anywhere I want, any time I want, for a few thousand dollars per year. We would have to robo taxi about 30x per week... How does that pencil out for me? Can I get 1500 rides per year for what I pay for private car ownership? My round trip drive to work is 75 miles. That costs me about $10 in fuel. The car I use, I paid $9000 for, 5 years ago, and will probably drive for 10 more... Literally for $2k per year I can go anywhere at any time.
This seems like an extension of the "you will own nothing, rent and subscribe to everything, and make others very wealthy while doing so".