DON'T PANIC!!!
I was lamenting the same thing about space last night- but earlier in the week I was noticing what a large number of really good post there was there... TIMING IS EVERYTHING.
I have noticed several times before that there often is a weekend lull in the space board (Which is odd, since I would have predicted spikes in postings on the weekend)... as for moderates versus extremists- well (ignoring the fact that moderate is in the eye of the beholder) extremists will always post more...
You can always do something about it....
