Nothing about autonomous vehicles has ever prevented municipalities from improving public transit and in all likelihood, never will. They're two entirely separate pots of money by two entirely separate sets of organizations.

American transit sucks. It's sucked for decades. It's going to continue sucking as long as we keep playing this stupid game of "let's discuss maybe eventually building something in 50 years" that happens in every metro area. In the meantime, I'll keep commuting by public transit to my job developing autonomous vehicles.