I heard that many surbubs are build on purpose without any public transport connection. Since you wouldn't put a bus stop by each gate, the switch to bus services would be far from elegant. And then you have shopping malls and all other services completely in other places. Reverse evolution of the sprawls might be very interesting... though hardly pretty.

In a parallel thread, I have an intermediate transportation proposal, where clients would submit their travel requests, and a transportation company would route its cars or minibuses to satisfy those requests. It is like taxi, but with different passengers served together. The idea is simple, actually, though possibly not implemented anywhere, due to complexities of routing and request communication. But with modern technologies of wireless communication and the internet, these problems can be handled. I believe this system could be acceptable to regular car users right now, and it would help to reduce traffic and its emissions substantially. Don't you think that this system can be viable somewhere in the US?