Another point that lots of people, especially in the US, seem to miss is that these cars are (mostly) not meant to be sold. The main use case is that people will just call one when needed. If done on a large scale there will be a much larger number of cars available than current taxis, so one will almost always be nearby.
Transportation is not a product, it's a service.
Much cheaper and requires far less parking space. Also you don't need to bother ever again with repairs and model upgrades. Remember: private cars spend >90% of their time parked. Waste of time and space.
No wonder Google is making its own cars. Conventional car makers are probably scared shitless of this future and would do anything to keep the public in the old world.