Maybe the wiki will end up saying "Just donate to SIAI. Unless you're qualified to work for SIAI, there really isn't much else you can do to help save the world."

If this is the answer then the SIAI should simply conclude this in a paper. Or EY should write a new sequence that concludes that supporting the SIAI is the rational choice if you want to save the world. I believe a Wiki would just add to the confusion. A wiki is good as a work of reference or a collaborative focal point for people working on a certain project. But when it comes to answering a certain question, a Wiki might lead people astray.

I'm still puzzled by the fact that saving the world is not much dealt with on Less Wrong. What would be a better way to exemplify rational choice than concluding what to do when you want to save the world. On Less Wrong rationality is an abstract concept that is seldom used to tackle real life decisions.