I think this will be a crucial thing to figure out. On the one hand, I think it's important to be as inclusive as possible, and avoid being overly pedantic and stay away from the extreme degree of elitism that infects many stackexchange sites. BUT.. on the other hand, we want the site to be of interest to everyone from hobbyists to serious academic researchers.
The one thing I think we need to be leery of, is having the site become overly oriented towards trans-humanism, Singularity, etc. I think those things are on-topic, but I suspect it would be easy to drift into a place where we're more fringe-science / sci-fi than serious AI research. Exactly how to strike that balance, I'm afraid I don't really know.