> There's no significant untapped well of car ownership to be found from self-driving cars.

At what age might you be comfortable letting your child self-drive to school, but not walk alone to school?

That doesn't increase the number of cars a family needs, it just automates a previously manual task.

It doesn't increase the number of vehicles needed, but it may increase the number of vehicles wanted. If a family of four has two kids that attend different schools, and two jobs in different locations, and everything starts at 8 am (because, life); each person can most delay leaving the house if there is one vehicle per person.

An incredible edge case, not an untapped market. And how does your hypothetical scenario work today? Right, some people get to arrive a bit earlier.