This seems like the inevitable conclusion: autonomous cars bring you from your house to your destination, unless you are traveling through a thoroughfare. In which case they will drop you at a tram (ideally drop you at the platform), the tram gets you through the bottleneck, and another private car will take you from the tram stop to your actual destination.

There’s no efficient way for busses to get people close to their door. It makes no sense. Mass transit should relieve congestion on major routes, it’s not an efficient solution to the last mile problem.