My sister is trying to get a job with Google, I think for an autonomous car project. Today she said that cars were a big waste of money for something that you only spent a percentage of your time using. I responded that ride sharing should work fine in a dense area like an apartment building, but heaven forbid that people need to walk to access a car in a normal neighborhood!
Then I wondered about a roommate situation. How much would one need to charge roommates to allow them to run errands in it, as long as they are not gone for an hour or two, and they plug in when they return.