Automated cars are still decades away. As road space is even more valuable than parking, that's a net loss. There would have to be a multiplier for people sharing use of a vehicle. But people already hate mass transit, people are still expected to get to work at 8 a.m., and ordering a ride will never be a convenient as having their own vehicle available 24/7 so the maximal size of the fleet of all cars might only 25% less.
