And can understand that leaving things as they are is probably the best option, but we shouldn't rule out expanding our focus as well. Nowadays the concept of discussing all types of books interests me more than just discussing SF&F (even if SF&F may still be the majority of what I read and discuss)

I also wouldn't assume that people are arriving at the site via a search engine or that even if they do that will somehow allow them to understand the site structure as a whole. In fairness however the time most new visitors would spend lurking before making a post would probably allow them to learn the rules of what goes where.