A few months later, I decided to start a non-profit with the goal of building a site that would actually be able to stick to its principles and address a lot of the issues that I think are hurting online communities: https://blog.tildes.net/announcing-tildes (HN discussion of the announcement here: https://news.ycombinator.com/item?id=17103093)
It's in private alpha and is still fairly small, but it focuses on higher-quality non-fluff content and discussions, and gets several hundred posts/comments a day. If you (or anyone else) is interested in an invite, please read the blog post I linked above and send me an email at the address listed in there and I'll be happy to give you one.