I think that will happen automatically. The market would change: cars would be bought more and more by companies providing them to others for a fee, like with t

I think that will happen automatically. The market would change: cars would be bought more and more by companies providing them to others for a fee, like with trains and airplanes. With the current logistical problem of car-sharing out of the way (specifically: the labor costs associated with a driver and the risks that human poses to the car), that becomes viable very quickly. Those companies would differentiate between cars on different criteria than current consumers and would demand higher quality, longer-lived cars. Car manufacturers will have to adjust.