I'd love to see NYC co-opt SV as the world capital of the tech industry, and I think it could totally happen. The only thing SV has going is historical inertia, and it's eroding. This housing problem in SV is going to make it erode faster.
Honestly I don't understand SV at all. They say NYC has a housing cost problem, and it sure does, but it's nothing compared to SV -- in SV you have people paying Manhattan prices so they can live in SF... yet somehow still commuting an hour to the suburbs where the offices are! At least here you can either pay Manhattan prices and get a 10 minute commute for it -- or take an hour-long commute and at least get a much cheaper and/or larger place in exchange. And your commute won't require you to drive, unless you want that.
NB: I've never lived in the SV area so maybe I have some misconceptions that need correcting? :-)