Make the wiki the front-and-center place where LW's content resides.
Today, most of the interesting content is in the Sequences, which are interlinked to each other (to some degree), but which do not link to the wiki. You could move the Sequences to the wiki. This would get people onto it. Part of why the Sequences are considered to be poorly organized is that the organization efforts can't touch the actual Sequences. Moving them to the wiki would change this. I expect the Sequences to improve with more eyes.
(Potential drawback: people don't expect blog posts to appear in wiki format, and could easily be confused about what Less Wrong was.)
I approve of your boldness, but I don't think this is a good idea. The Sequences are written as essays and have comments. Wikis aren't the right place for that sort of content.
How can we incentivize more productive activity on the LW wiki? There are many articles that could be created or expanded.
Are there previous discussions on this?
One suggestion: We could add a "good explanation!" button at the bottom of each article, and every time it is clicked, the user account responsible for the plurality of words in the current draft of the article gets 10 karma points. This requires that LW and LW-wiki accounts be synced, first.
How can this suggestion be improved?
What other suggestions do people have?