I would see this as an intellectual challenge.
I don't want to water down HN. I like the relatively narrow focus here -- I know that when I come to the front page, there are likely a dozen links or discussions that I will want to read. The same can't be said for other communities with greatly expanded focuses.
I realize that online communities develop over time, and some expansion is natural. I am just concerned about how wide the funnel is getting.
Hacker News: Stuff that's interesting to the intellectually curious
I think it will help make the purpose of this site clear to everyone, and hopefully have a positive impact on the comments as well by reminding people that the discussions should have an intellectual component.