If your phone knows where your next event is, the car knows where to go and will entertain you along the way, providing screen-based entertainment and maybe even a little exercise machine.
It will be very cheap and very efficient. You will feel good about it.
Zillions of dollars will flow in many directions.
There will be a lot fewer vehicles on the street, and the streets will be completely different, with commerce and entertainment dominating walkable space, as people seek goods, services, and experiences on foot.