The way to preserve what HN has that is good (and I'm not saying it's great, only that it's better than it might be) is to have a clear set of principles and communicate them. If you know a better set of principles, where the fitness function is high-quality discussion at scale, I'd love to hear what they are. Otherwise I'm going to suspect you of magical thinking, in which HN's current level is assumed to just happen for free, and for some reason meddlesome thought police keep intruding on it.