Self-driving cars will be an unbelievable resource saver in the transportation space as well. Not only will families that currently have two cars need at most one because commuting won't be required, but they won't even need one. They'll just call an automated taxi whenever they need to go somewhere. Hit a button on your phone and a car shows up in 30 seconds, drives you where you need to go and drops you off for substantially less cost than what you pay per mile owning your own vehicle today. Consider a world in which we need only 1/10th of the number of automobiles -- even assuming the same level of local travel -- because the cars that exist are nearly always in motion rather than being parked most of the time. Eliminate nearly all of the parking lots and driveways and garages and suburban sprawl becomes considerably more compact and efficient, even without shifting to high-density housing, which means even less need of automobile travel, because walking and cycling are more feasible.
It's a struggle to see a huge difference between these "driverless cars" and taxis. I notice taxis haven't produced the outcome you describe.