There is no way to know if Culdesac's car-free experiment in Tempe, AZ will be successful, but it's the kind of endeavour that needs to be called to attention as an example of development where people are trying new things.
If I were a betting man, I would put my money on this, only for the fact that it's innovating in a way that's rarely been seen in housing, at least in recent years.
How do we get more of those experiments underway?