It's also a cultural thing. People living in the centre of big cities often don't own cars (or even have drivers licenses). IIRC I read once that half of New Yorkers didn't own a car? These people will probably be happy with changing out the Yellow cabs for autonomous shared vehicles. But yeah, suburbanites and rural folks less so.
Then there is also the lifestyle choice. Where I live I could easily get away with not owning a car, but I happen to really enjoy going on weekend drives. If I did the math I could probably come to the outcome that financially it would be better for me to not own a car and rent one during the weekends or something, but I like the freedom of choice, the prestige of owning my own vehicle, knowing that every KM on the odometer has been driven by me, taking care of it. Small things like that. Sure, there are plenty of people out there who don't give a shit about these things, just as I don't give a shit about people who bike everywhere, but there are also plenty of people like me who just like driving.