I think a lot of the "startup hubs" are missing the need for a "top notch university". The ~4 year talent turn over and resupply is key, it provides an ongoing top up as talent churns. Does it work in startup hubs that don't have a "top notch technical university"?
Portland (OR) comes to mind as a place where there's some fantastic tech people and no university, but I'm not sure if it's considered a startup hub or not.
