This is a great question.
Well one thing I want to mention -- maybe I'm dodging your question for the moment -- is that Paleohacks would still serve a great purpose even if it somehow, theoretically, lost all interest to longtime users. I told a friend about the website once, because she was learning about the "lifestyle." She came back to me a week later and told me: "Paleohacks is amazing. Every question I could have possibly been interested in is there. Omega-3? Type it in, there it is. Weight loss? Type it in, there it is. Green beans? Type it in, there it is." And so on. (Although maybe I shouldn't be making the green beans joke, since that was before my time.)
But perhaps I'm coming around to your question, because this does suggest at least one thing we could work on more: fine-tuning the answers to the basic questions, making them better and better. Because for every one registered user with a screen name and a presence in the conversation, there might be two more who are just reading along. A lot of those are beginners. How about making things better for them?
One problem we encounter here is that when old threads are refreshed with new answers or new edits, relatively few users look at them. It's always more exciting to see a new question. So there's not all that much incentive to go back and edit your answers; even if it had nothing to do with reputation, there would still be the issue of views. Why do that work if no one is going to look at it?
This leads me to believe that the "repetitiveness" of near-duplicate questions is not an entirely bad thing. It's almost like we want slight variations on the same theme, just like we want to watch the same romantic comedy over and over again, but with different actors and actresses. Patrik anyhow endorses the idea in the FAQ:
Please look around to see if your
question has already been asked (and
maybe even answered!) before you ask.
If you end up asking a question that
has been asked before, that is OK and
deliberately allowed. Other users will
hopefully edit in links to related or
similar questions to help future
visitors find their way.
But if that doesn't satisfy, if the re-working of old plotlines is not enough for us, then how about this: things do change in the paleo world. Think about all that has happened just in the last year or so: the fall of insulin, the rise of the potato, skepticism about fish oil, the re-discovery of choline -- not nearly as earth-shattering as world affairs, to be sure, but for those of us who dedicate a big chunk of our free time to thinking about this stuff it's enough to keep things at least somewhat fresh.
Maybe the site will slow down a little bit. But I don't think things should come to a stop. These two things -- refining our answers to old questions, and dealing with the occasional new ones -- are definitely enough to keep us going. These aren't startling new ideas from me, I admit, but I'm more the synthesizing type than the creative type anyway. So that's how I see things.
(Note: My own personal project is to try to keep learning about human metabolism. Because even if a lot of the basics are well-known and can be learned with biochemistry textbooks, a lot of it is still unknown. And even if it is known, even if it's out there somewhere, there's still the challenge of putting it together. I think a lot of this work happens in various places on Paleohacks, even if that's not everyone's cup of tea -- and I certainly don't think it should be. Sorry about the long answer, but, you know, in for a penny in for a pound.)