What I find most interesting about this post is that the comments section is replaced with links to Reddit and Hacker News. Not a bad way to stir up attention to a post.
We'd end up reinventing HN, Reddit, Digg, &c. One of the reasons I prefer to link to HN is that there is a community with a well-understood standard for behaviour. If I had my own comments, I'd have to ask people to live up to some set of arbitrary standards, and that's a lot to ask when someone might only read one thing from me every month or so.