The USA has proven to be... incapable of completing any public transport infrastructure anywhere near on budget or on time. This is a deeply rooted problem. Until this gets solved autonomous electric vehicles could theoretically just leapfrog the problem altogether. Point to point transportation also mostly solves the last mile problem.

Point to point transportation is not sustainable with a vehicle as large as a car. The physics are simply quite poor and there are too many people to move, at least in cities with real traffic like LA or NYC vs small edge case backups.