The connection to ownership works for things you operate. If I do my own laundry I want a nice washing machine, and I'll shop for one, upgrade on features, etc. Same for kitchen knives.
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).