We were told that Uber would mean fewer cars on the road, and in fact it's led to exactly the opposite - an explosion of additional VMTs, with all the accompanying pollution, resource waste, congestion, and crash deaths.

If AV taxis are cheap then people are going to use them for all sorts of things they previously could not afford to use a taxi for.

And if they're expensive then they will cannibalize public transport for the benefit of the upper economic classes and the significant detriment of people of lesser means.

There is no way this turns into a net good.