Would having a BG similar to the BGs in Dark Age of Camelot work for WoW? Where there are no queue times and no limit to the number of players nor a time limit before it ends. Where you just show up, join a group, and roam around slaughtering everyone you saw for as long as you wanted. Also there were pretty much no objectives other than take the Keep in the middle of the map. After your side controls it you just roam around killing people. Could increase the Honor gained for controlling the Keep to give people incentives to control and keep it. The number of people can easily be kept low by having many different instances of the BG so they dont have so many people they crash. Like maybe a 100 per side maximum.