On the other hand you've now added a whole new layer of friction to using a car. Sure, in theory you'll just hit a button on an app and a car will show up in a few minutes, and it's only a minor inconvenience. But what happens if there is a bug in the software? Or if your account at the giant fleet company gets suspended out of the blue for an opaque reason?

There's also the loss of being able to buy and customize a car that's exactly what the end user wants. This doesn't matter at all to a lot of drivers, but matters a great deal to some.

What happens when I lose my key?

What happens when I drink too much before needing to go home?

What happens if my car gets hit in the parking lot or broken into and I need to deal with calling the cops and trying to obtain the security camera footage before leaving?

The truth is no solution is without problems.

The transportation as a service model has more pros for me than cons. Plus it would mean fewer cars on the road overall and less need for parking spaces when autonomous vehicles can take us places and no longer need to be parked to wait for us.

Your second argument is akin to people wanting to build a house instead of financing and buying an existing house.

For alot of car buying folks, the financing and available inventory determines the 'want'.