As long as the worldwide financial markets will only fund startups in SV staffed by young Stanford grads, Stanford will never be able to produce enough grads to staff the result of a world wide financial bubble. Imagine if the housing bubble last decade would only hire house framing carpenters born in Boise ID.
Eventually the idea of doing a startup in Chicago, Berlin, Paris, Prague, will change from "impossible" to "insanely rebellious and financially reckless" to "thats a great idea" and at that point the candidate pool being too small will disappear.
There are other exogenous forces such as companies that want to hire H1Bs, for whatever reason, must in public declare a labor shortage for legal reasons regardless if one exists or not. I'm not trying to debate H1B program but to state authoritatively that it legally requires corporate statements about the labor market to a pre-defined value of 'shortage' regardless of actual market conditions. As if in a thought experiment federal regulators required CNBC to report false numbers for todays Dow Jones index and people actually debated policy based on the legally required fake numbers. Any corporate statement by any company hiring, or planning to hire H1Bs in the future, is inherently legally required to be a false, fixed statement of 'shortage'.