Count me in the "Nay" column. I like the idea of restructured FAQ which would work in this way, but simply "stickfying" every popular thread raises its own issues and changes the nature of the discussion. Sometimes it is nice to have the same question asked again - it forces us to look at it in a new way.

So my recommendation would be to create a locked FAQ and then have mods cherry-pick worth submissions from discussions to add to the FAQs.

Just my two cents.