Earlier quoted context omitted.
Inequality is not the problem. The problem is there are more people who want to live somewhere than there are houses. With perfect equality there would still be more people than houses. The one and only fix is more houses. That's it. Any other solution is just picking winners and losers different ways. But no matter which way you pick the same number of people win and the same number lose.
The fix is to make more areas desirable to live in by reducing income inequality and stimulating local economies (which in turn creates more desirable locations). Simply saying build "more houses" in clustered cities along the coasts doesn't solve anything in the long run. Cities are in it for the long run.
Despite having significant growth opportunity San Fran is already twice as dense as Seattle. Therefore Seattle has room for explosive housing growth. It would need more changes than just housing of course. But that's to be expected and totally doable.
Cities are huge economic multipliers. We don't need more cities yet. The ones we have are perfectly great! We need to more efficiently use what we already have.
This housing crisis isn't affecting just "top tier" cities. It's not just New York and San Fran. It's Seattle. It's Denver, Austin, and Portland. It's even Nashville!
Every city, top to bottom, needs to be doing more. And they need to start now as the longer they wait the more expensive the infrastructure adjustments become.