Yep. In today’s high tech job market you projects change all the time, you go where your specialty is needed. There’s no such thing as “a job for life” anymore. For example you are a genetic engineer that specializes in X…and there only a few in the country that can do x…when one project is finished company A doesn’t need X any more they need Z. You find a company that needs X. oops, that’s in Portland.
I do say that flippers for the last few years have been feeding of the engineers in San Diego, adding fuel to the fire.