I would say removing the need for personal vehicles were possible would be a much more powerful force, but yours is much more practical at least short term (decade's time frame).
Complete aside, I wish that we had things like that, like doorways to other parts of the world.
Let's go to lunch in Tbilisi walks through door to there. Once done, just walk back through to home.
I am of course talking about public transportation. Bike + tram + train keeps the citizens fit and healthy.
Going from car parking to car parking must suck, what a way to live
There's plenty of cars in Europe and in some sense traffic is worse there than here in NZ.
Let's not pretend they gone extinct there and everything is fine and dandy just because you walked everywhere for a week while visiting some old town.