Like others have mentioned, the possibility of a brain-drain from SF is a very likely scenario in a few years (if the cost of living stays this shitty). It would be more beneficial if startup land would decide on one of the secondary tech hubs as opposed to everyone going wherever. Having 2 people move to Seattle, 4 of them to Boulder and 3 to Phoenix isn't gonna establish much in either of those. But having 10 people all move to Austin seems like a bigger impact.