We have Uber, where you can already have a car to your door within a few minutes, at least for a decent number of us.

There's a lot of geographical area where it's not true (i.e. most of the UK) but the vast majority of trips for most people are within a few km radius.

The difference is that the driver gets out and you get in. It's a big difference in terms of implementation, but it's not so wildly new an idea. See other comments under my original comment, talking about rental companies doing it already. Yes they do it already, but not with a click on an app, within a few minutes, for a reasonable price.

If (car delivery/pickup) drivers could teleport between cars, would there be much else in the way of this happening for real?