Not so sure on these ideas, but I'm going to throw them out anyway.
What about low votes and/or extremely inactive authors' submissions go into the wiki-style range? I'm not sure if wiki style posts keep a history of edits, though that would be nice in these situations.
Or maybe certain really old posts (low votes/ inactive authots again) can be requested to change hands, or have a mod add a new author to it, so that it can be edited. It would be interesting to have a list of subs that are "up for grabs" for those of us who would like a foundation to work from.
I still like the idea of implementing some sort of raffle system, the dice game is a step towards it but I'll say it here now: This is probably a bad idea, as we promote freely sharing ideas, but what about raffling off subs/ideas/hooks for expansion, and if done within a time limit and reach a certain vote (3?), they grant extra xp? Just a few ideas. But I do like the thought of revisiting old subs, good call, Silv.