I get the point - and I support the development of car-free suburbs for people who want them. Streets safe for children, people saying hello instead of staring from behind closed windows, etc. Less local pollution, more friendly streets, less accidents : all pluses. I just don't want to see some zealot telling me I can't have a car, and that I am some sort of evil person for having one. Further, not everywhere is sui…
In the US, it's basically illegal to build any kind of development that doesn't require a car or two. Some exceptions, like Kentlands in MD, or Stapleton in Denver, require developers to prepare plans in advance, lobby for variances to zoning and parking requirements. It's also harder to get financing for non-standard projects. All this means that unless you're building a standard subdivision, an office park, or a strip mall, you're at a competitive disadvantage and incur higher costs and risks.
Let there be no illusion that the "market" provided the built environment we have.