Cars have more functions than purely transport. They are great containers of stuff, you can leave tools, laptops , spare clothes etc in them without having to

Cars have more functions than purely transport. They are great containers of stuff, you can leave tools, laptops , spare clothes etc in them without having to load and unload every time you want to go to work. They're also status markets, so I suspect the rich will want to keep their own cars for this purpose which will lead to the middle class also being hesitant to give them up. You also have logistical problems like what if I take an autonomous car for the day and decide I need to take a long cross country trip in it? You also have special requirements for some cars, like perhaps I need access to a car with a lot of seats or I want to be able to carry a trailer and I can't guarantee that a car fit for this purpose will always be available.