A culture more intelligent seems to usually destroy the one before it. It's just never the outliers alone who make such a change, the few people with the edge are never the majority. A culture has to slowly raise in level and get to the point when most members of it are naturally above the previous one, so collapse of the old can and will happen, inevitably. But those outliers will never fit any of those cultures. They always seek the novel, the different, things that are authentic in an otherwise copycat society, they avoid conforming to the mainstream, be it rigid patriarchy or slutfest feminism.
http://www.intelligentpeopleforum.com