I used to live out in the boonies, trust me when I say that public transit is more simple than you think in rural areas. There will remain the need for cars and trucks for rural areas, but that doesn't mean we can't have train stations going between county seats, busses between towns, and express trains to the nearest big city. Urban sprawl absolutely is a challenge to public transit while deprogramming our collective car brain, but the trick is to place transit where people are to where people want to go. Suburbs already answer 1 of those 2 sides in the equation.