I think you're underestimating the power of early-adopters/sneezers. For instance, lots of people have kids, and their friends have kids...

Whats important here is that the type of people that will pay attention enough to go to tc50/demo aren't just going to go there and then not say anything about it.

They'll come home, get on their macbooks and start blogging what they saw ( some really nice programmers building a kids network ). Some of their friends will check out the links, maybe share it on facebook, myspace, or , gosh, in an email. And so forth...