I guess what I don't understand is, given the current state, 1) what do you want? 2) how much will it cost? (and how will we pay for it?) and 3) what are the tradeoffs?
On a related note, it seems like a lot of the anti-car/urban planning wonks have a belief that everyone really wants to walk, ride bikes, or take mass transit everywhere, and I think they're wrong. Most people want to drive personal vehicles.
Maybe if we lived in a world where mass transit had very strictly enforced behavioral norms, more would consider it. But even then, I still think most people prefer the many conveniences afforded by personal vehicles.