That actually sorta? exists! Vay uses remotely teleoperated vehicles in Vegas to drop off your rental, then take it away once you're done.

https://vay.io/

This is the best combo possible. It feels like the ideal trade-off between the autonomy of car ownership and the flexibility of ride-sharing. I've been hearing about this concept for literally over a decade now.

I hope it expands quickly to the rest of the US.

You're kidding. This cannot be real. I can't wait to try it, if it is somehow real.