How is an autonomous car any different from taking an Uber? I think most people who currently own a car rather than taking an Uber or taxi everywhere will continue to own a car after self driving cars are a thing - there is a lot of value in having a car immediately available to you no matter what, and it's nice to drive around in your car that is set up how you want and has all of your things in it.

I think if autonomous cars are much cheaper than Uber it could push some people to get rid of their car due to cost, but personally I would never do that since a cheap car isn't a huge expense.