Thank you.

This looks like a case where the typical mind fallacy paid off. Part of why I made the brainstorming post is that I assumed people were like me-- blanking out when trying to come up with ideas. This gave me a theory which meant that a small amount of action might help, unlike the idea that LW had lost its best posters (but then why aren't we getting new major posters?) or that social groups (especially if they're dependent on new ideas) have a natural life cycle ending in death. Also, I consistently have karma over 90%, so I knew that fear of getting downvoted couldn't be the whole problem.