No idea. Personally, I hate DUMBO and find it very inconvenient (from elsewhere in Brooklyn), but I know maybe a dozen hacker types who live over there.
*raises hand for etsy. There's definitely an interesting art scene in and around the dumbo area, and I get the impression that it's on its way to becoming a viable place for tech as well.
Honest question: How many people actually live near their work in DUMBO or Downtown?