[akgerber]

Most American cities have many neighborhoods that aren't laid out to be accessible by non-automotive means. But that doesn't mean we should have zoning codes that require that to be the case always and forever, and that doesn't mean new neighborhoods should be built in the same way. American population is shifting and expanding, and we will have to significantly rebuild our cities over our lifetimes— we should rebuild them wisely!

The fact that $200,000 houses sit on $800,000+ worth of land in Silicon Valley means that, if policy were changed to allow reasonable density, Silicon Valley would quickly densify to the point that walkable neighborhood retail and mass transit would have a lot of customers. And mass transit needs a lot of customers to run at a reasonable frequency.