I'm worried that cars, given subsidies, are too much of an anti-agglomerator, and thus active measures must be taken. It is as if we used to have clumps of mat

I'm worried that cars, given subsidies, are too much of an anti-agglomerator, and thus active measures must be taken. It is as if we used to have clumps of matter bound together by gravity, enforced by magic that new matter must be spread out (zoning) but also charged the matter (cars). Merely stopping the magic doesn't meant gravity will overpower electromagnetism. Zoning and car culture achieved dominance in tandem, and so I am quit skeptical of any certainty that fixing one alone is sufficient to roll back the clock. There could be other sorts of hystersis too that make this challenging. Really we should be very careful and vigilant and not rely on one tactic to eradicate the scourge of suburbanization.