The topic of a wiki has been talked about multiple times, the latest attempt being the whole “Wiki” section of the forum. People can already create wiki threads there, with posts editable by everybody.
The weakest part though is that people just do not contribute. There was a big work at the time to index all the interesting threads and put them in the wiki section, but the reality is that nobody ever added another useful information in this section.
My experience after four years on the forum is that people don’t really wan’t to contribute to a wiki and prefer being spoon-fed by the few having a meaningful experience with investing.The proof of this is the recurrence of the questions asked on the forum.
So we can try a wiki outside of the forum, but with a caveat: the most likely outcome is that _MP will have to write it all.