Essentially, people can steal them, modify them and re-publish them I think.
Still think it's a good idea though. Actually, the current infrastructure of the site might be a good platform for this. Forum members could volunteer to make a kind of synopsis of the information in a thread that they think is worthy of turning into an article, and post the result in a dedicated place in the forum. Then other forum members could give a feedback, and the author could edit his article accordingly. Then after a week or so, the admins validate (or not) the article and publish it on the mainsite. Maybe not quite as free going as Wikipedia, but it would enable the different forum members to be recognized for their work, and would give them an entry into technical journalism maybe? And it would give more content to the mainsite!