The thing is that even in rural areas the logistics of autonomous cars allow you to get away with just one for an entire family. The fact that the car can come

The thing is that even in rural areas the logistics of autonomous cars allow you to get away with just one for an entire family. The fact that the car can come back home and pick someone else up later means that even if there are still people who own cars (and I suspect lots of people still will) sharing amongst small groups will likely decrease overall count of owned vehicles.