I think we're in the last decade of "buying" and owning a car individually. Seems natural that once self driving is competent enough to get unmanned cars from A to B, you'll just subscribe to your provider of choice and beckon a car when you need it, like Uber. It's basically public cloud for transportation. Our average utilization of our cars is terrible. Parking lots and garages are minimally required in this reality.

Sounds a lot like well-run self-driving buses would be even more efficient, were the streets devoid of other traffic.