Buses already rely on private car drivers subsidising them via road damage. Bus can do 10,000-20,000 times more damage. Extrapolate that and it’s actually cheaper to be in a taxi.
I wonder if that's true. With the volume of taxis necessary to replace busses, you have to think about the increased fuel and maintenance costs, the increased costs related directly to traffic, and indirectly in the form of losses from accidents, etc.