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I can think of two reasons on the top of my head:

1. Renting a car will become much more convenient. I can summon a car instead of having to search one 3 blocks away.

2. Selling a car with an L5-autopilot will have to include a manufacturer warranty/insurance in cases of crashes resulting from a fault of the autopilot. Tesla is already charging 10k (or 15k?) for their shitty self-driving-gimmick without a warranty. I expect L5-autopilots to cost much more and even come at a yearly subscription (which basically offsets the insurance and the required continued development). I don't expect the average person will (be able to) pay that subscription, when the far more reasonable solution is to rent a car.