My guess is that this is the kind of thing it’s tricky to get and maintain critical mass for. Reminds me of the Beeminder subreddit, which I’m delighted exists but it’s clear to everyone that all the cool kids are over here so it’s hard to find motivation to put in effort over there.
If folks prove me wrong and the wiki picks up steam, I will be very excited. And definitely count my vote and willingness to contribute to it. Also say the word and I’ll shout it from the twittertops and beemails and whatnot.