Your stated aim for the constituency of the news.yc community is "the 10,000 best hackers and nobody else". If you achieved that aim, you'd have a monoculture. It would be a slightly different monoculture than the current one and less in your image, but a monoculture nonetheless. If it's even possible to move away from monoculture without moving toward Digg, I don't think it's worth the risk of trying.