I'm sure in the same way many people can own and ride horses, or own their own boats while most travel on communal naval vessels, the option will still exist to

I'm sure in the same way many people can own and ride horses, or own their own boats while most travel on communal naval vessels, the option will still exist to own your own private auto. The technology needs to advance to the point where it can handle human drivers, and at that point it will be more than sufficiently capable of handling peer autos who behave much more logically. It will just be way more economically efficient to have the subscription model so you maximize vehicular utilization, so you just pay the premium difference of that efficiency. I cannot imagine they will be significantly more expensive than a Tesla is today.