[joe_the_user]

You can only fit so much housing in SF.

That's literally not true. Human density can go far beyond what SF has. In fact, you could fit a lot more people in SF with only part of the city getting higher density.

The idea that each city should "do it's part" has no basis in sane urban planing. We know the current distribution of density isn't useful and this more or less just makes it permanent.