Agree strongly with this. Just because the wiki model is publicly editable does not mean that everyone should make significant contributions. (See Wikipedia on being bold and "minor edits".) Expertise is still a requirement (arguably even more so than with most posts in Main), especially with scholarly or advanced topics such as some of the ones linked in the OP at first glance.
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?