yeah, that's precisely it, except no McMansions, but condos or apartment buildings instead. In order to make a profit, the developers will have to up the prices. Nothing comes in cheap. That much sudden density will cause traffic jams on roads not designed to take in that many cars, but maybe, decades later, the public transit infrastructure will become developed enough to help.

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At best, I see this as a heavy-handed attempt to force the cities and suburbs to densify, but it'll come with a lot of pain for the next 15, 20 years.