I'm curious to hear other's thoughts on they think would be useful.
Please don't hold back ideas! There's very little harm positing silly or unlikely ideas, but there is some potential value (perhaps more than you realize).
Inspired in part by calebo's comment here
EA longitudinal studies
I think the movement might benefit from uncovering predictors of value drift / EA specific causes of mental health issues. It would be interesting to see how ideas propagate from the leaders to the followers.
Also, delegating all the surveys to the central planner might make them more well-thought and might make it easier to integrate the results of different surveys into conclusions.
Note that it is possible to do longitudinal analysis with the EA Survey, and we have done some in the past (such as for retention, GWWC pledge keeping, and changes in cause preferences). I'd be happy to help walk people through how they can do their own longitudinal analyses and what the relevant caveats are.