I've seen this so many times before, though. It's one of the basic rules of the internet; every community will converge to 4chan. Hell, even 4chan couldn't get rid of their 'cancer'.

I would like to see a HN-style board which does not have a public client, but rather only a public protocol specification. Only people who can actually implement the protocol would be allowed to join. The only thing I haven't figured out yet is how to stop people from publishing open source clients - I'm thinking angry nerd death squads.