What if investor seeding would be hugely beneficial for a hub to become "the next SV". Imagine this thought experiment...pg overcome with nostalgia convinces YC to permanently move to Pittsburgh and change the standard recommendation to "stay 3 month in Pittsburgh". I'm not convinced YC would implode..there'd be some difficulties sure. But I'd also expect (some of) the money to follow YC.
A "Pittsburgh batch" (to go along with the regular one) might actually be an interesting experiment to run.