I had to stay away from this thread because I felt like I couldn't post maturely on it - I'm still not certain I can. The OP reads like a threat, like "if you don't post more content I'm taking away your toys" sort of threat. For whatever reason I respond really poorly to threats, and I usually egg on the person threatening me, to my own detriment.
With that said, I couldn't really see what the problem was from the numbers posted. Is it that there are not enough *different* voices, or just that there aren't enough voices in general? I think we attract a certain type of person and so I tend to think we mostly agree on everything except contentious topics like religion and politics. If that causes a sense of stagnation (not enough disagreement) than that is entirely a different problem of not having enough posts.
I'm not really sure what can be done in terms of more threads, more post, more new people because I really don't like the idea that people would start threads or posts just to appear more busy than it really is. That seems awfully artificial. If it's *only* a monetary concern, that's another matter entirely. I'd support a 'subscription' thing, so long as it didn't make it seem like an even more exclusive 'insider/outsider' thing than we've already got people arguing exists. TFP is as good of as any other charity to donate to, as far as I'm concerned. Some of the advice I've have received here (and continue to receive) is far cheaper than a psychologist would be. It'd be a high ROI for me, if I look at it entirely selfishly.