Self-driving taxis can pick up multiple people going to the same place and take them there no matter where they want to go.
Of course the US has a lot more problems with implementing public transport that aren't easy to solve and are rooted in zoning/city planning. Single family home suburbs don't have the density to justify public transit.
I'm glad that someone is forcing the move away from fossil fuels. Because even in a "progressive" bike friendly town, I see how popular that is. Not very, even among the young and childless.
And self-driving doesn't have much to do with saving the environment. It's about saving lives, considering the massive number of people killed and injured by cars every year. As far as ways to get rich and things for the wealthy to spend their time and money on, that's a pretty good choice in my book.