So what? Do you think the people living in Seattle want to move somewhere else? Where? Repeat it for any of the booming west coast & sunbelt metro areas you want.
It should be clear by now that the '08 crash wasn't the same everywhere. Someplaces like CT never recovered because those cushy finance jobs never came back to CT and there was nothing else in CT and noone really wanted to live in CT (see masses of people on TGR who grew up in CT and moved away and get offended by you calling it a shithole). Other places the dip was momentary (Seattle, Bay Area) because they are still desirable places to live. Desires change over time of course, but do you see a mass migration of the US population back to the rust belt?