There are some objects we enjoy forming a relationship with. Your favorite kitchen knife. Your bed. Your sports car you take out on the weekend.
There are other objects we just want to work. Your running shoes. Your daily commuting vehicle. Your dish rack.
Of course it varies from person to person which items fall in which category.
There will always be a market for people who want to own and fetishize a car. The same way there is a market for people who want to own and fetishize their record collection.
But it is usually a smaller market than the market for people who just want convenient access to the thing. I.e. Spotify.
Which will be bigger, Spotify for mobility, or your neighborhood hipster automobile dealer?
The idea is that a subscription car service is likely to be significantly cheaper than owning your own.
I have a maid who does my laundry so I don't care about my washing machine anymore. I still cook so I want good knives, but if my maid were to start cooking I'd stop caring.
I don't own a car, but sometimes I rent one. And when I do I almost always pay 2-3x for a sports car because it's fun.
When I use Uber, I never pay for the upgrade to a nicer car. I'm just going to read or fiddle with my phone, so I don't care about the car at all.
I predict the exact same behavior for autonomous cars. And why would I pay $25k for a car when I can get the same thing for $1 a ride (and not have to worry about parking or maintenance or upgrades to new models).
I believe people like owning things, and using them to do stuff. This is a basic fact of being human. Probably goes right back to the stone age. I doubt autonomous cars will change that pattern.