I can't really imagine the circumstances where I wouldn't want to still own my own vehicle even if it had an autonomous mode. I drive it places where I don't have cellular service. I keep lots of stuff in the vehicle. It's customized with accessories like roofracks. I can hop in my vehicle from my house immediately whenever I want to.

If I lived in a city and garaging a car were inconvenient/expensive? Maybe. But that's not me or a lot of other people.

It's not going to be for everybody.

But if it's half the price over the course of a year? And you can summon it in advance cheaply? And it basically never takes more than 5 min to arrive anyways, since they're everywhere?

You might decide it's worth it to keep the stuff you really need in a messenger bag or backpack or something, the way people in NYC do. And maybe roof racks don't matter if you can just summon a second autonomous van behind you to hold whatever you were going to put on your roof.

Obviously if you're a contractor or something you'll need your own vehicle. But the point is that for most people, sure they can't keep stuff in their trunk all the time, but that's a happy tradeoff if the total cost of driving is 50% less.

Statistically, and from a global perspective, the apartment-dwelling car owner (most likely with a lower income than yours) is a heck of a lot more common than living in American-style suburbia or a small town.

Of course there will be exceptions or holdouts, but it will come for gig drivers, then for second cars, and go from there. There will be versions with roof racks, with extra luggage space, with child seats.

I would switch in an instant and get rid of my car