Except there is absolutely no reason it has to be like that in rural areas. Period. At all. Even a little. Look at China (or if you still believe the NED puts out legitimate stories, Denmark or Sweden or Norway) which has public transit to nearly all rural areas at least a couple times a week, and inter-village public transit in pretty much all villages that have more than a dozen people.

Busses are more efficient than independent vehicle ownership in all settings. All of them.