Some bogs (Yglesias, Klein, now Drum) are discussing regulations requiring parking when a building is erected. It's perceived as encouraging sprawl, locking society into dependence on the car, and adversely impacting the environment.
It's not a topic I've thought much about, but in a way it could be seen as the feudalization of society. In feudal society, each manor relied on its own forces for self-defense. With parking requirements, community parking is de-emphasized, each building has its own.