How about asking "What is the single most important change that would make you want to participate more frequently on Less Wrong?"
This question would probably not be useful for the census itself, but it seems like a great opportunity to brainstorm..
Given that it's been a while since the last survey (http://lesswrong.com/lw/lhg/2014_survey_results/)
It's now time to open the floor to suggestions of improvements to the last survey. If you have a question you think should be on the survey (perhaps with reasons why, predictions as to the result, or other useful commentary about a survey question)
Alternatively questions that should not be included in the next survey, with similar reasons as to why...
survey is now up (2016-03-26) http://lesswrong.com/lw/nfk/lesswrong_2016_survey/