That was a very interesting read, thanks! It's more focused on a "scene" and monetizing than I was thinking of, so it gives a different take on the same basic problem.
My general thought was influenced by various communities (RPGs, IF, Usenet, coding, etc) I've been part of or witnessed, and how they were unable to survive the swarm of slightly-interested. A few interested are good and healthy: You need the fresh blood to both replace those that leave and keep old-timers engaged. Too many and your norms and conventions are crushed and at a minimum you lose the sense of community, most often you lose the ability to communicate effectively.
There are plenty of historical parallels as well, or at least they seem to be - history is not my strong suit, so while I'll suspect the parallels line up, I won't go asserting it too far and will stick with the communities.
Usenet in the face of AOL is one example (I was there, it was tragic, and though we live in a wonderful age with a lot more information available, I think it's harder to FIND an in-depth discussion). Another example is, say, Slashdot. Originally it was the haven for techies, which made it popular, which made it NOT the haven for techies. After /., I moved through a few attempts communities and currently HN is one of my sources for discussion. While every community has it's nostaglics, I definitely feel like the last 2-3 years have had an increase in people talking about the decrease in quality comments. At this point, I've come to expect that eventually HN will fall prey to popularity and I'll have to find somewhere else to go.
In light of the article you linked, I'm not really sure how it links up. I guess too many "mops" are attracted, and even if you don't get any "sociopaths", just throwing the ratio of people that want it close-to-the-way-it-was to people who this-is-nice-on-my-terms off too much can drown the community in noise.
The disturbing thing is that I feel like the tail of the "mops" there. I'm not the creators, I'm usually not a fanatic. For example, while I'm _willing_, I've never gone through the trouble of contributing to any open source project beyond the most thin of bug reporting or the rare cash contribution. OTOH, I don't think I qualify as entitled, and I try to learn and abide by the norms of each community, so maybe this is a variation of Imposter Syndrome, maybe I just know my limitations, or maybe I'm a mooch.
I will ponder this. It dovetails in disturbing ways with some thoughts I've had about societal futures in a Fifth Wave sort of way. Thanks for the link, I'll have to look into "The Gervais Principle" he mentioned as well.