Why should they replace buses? What about self driving buses? What about an automated subway? It's just a box on a track, with the state of all the trains in t

Why should they replace buses? What about self driving buses? What about an automated subway? It's just a box on a track, with the state of all the trains in the track known, self driving would almost be overkill for subways/trams/trains. It's still public transport. There's no need to hold off the development on both ends.