depends on where you want to go with the idea. Of course you can go all the way and say noone will own cars anymore and personal transportation will be ubiquito

depends on where you want to go with the idea. Of course you can go all the way and say noone will own cars anymore and personal transportation will be ubiquitous everywhere, but it's much more likely that it will start slowly. People owning cars like today that drive and park themselves, after that maybe people are willing to rent out those cars when they don't need it. Many people probably would not do this all the time because they don't want to risk the car not being present when they actually need it in some cases. Only after that and only if enough of self driving cars are available at all times, would people really stop buying their own cars. Your idea of the drive-thru for self driving cars will also take some time to actually happen, self driving will not happen from 0 to 100 with all possibilities a reality from the beginning.