but if you live in an area with a nicely sustainable population density and there are no subventions (e.g. for cars/roads) involved this seems quite impossible

but if you live in an area with a nicely sustainable population density and there are no subventions (e.g. for cars/roads) involved this seems quite impossible to ever be the case Which means it's probably will be the case for the US as most of the us is either has a less sustainable, too low (e.g. "typical" US metro area, and well the endless rural areas(1)) or too high (e.g. city center) density. (1): Through very rural areas might not be substainable for any self driving car service either, so people there will most most likely still have their own car. And for reasons of serviceability much more likely a non self driving car.