I'd personally enjoy a tournament mode set up like tennis match where people register for the event it starts with the 72 man matches and as the teams win and lose the tournament moves to a different pvp mode until you've less players and move to the 24 man mode etc. until you reach the 4 vs 4 modes. However this'd require implementation on a system forcing players to play specifically to dungeon and raid party set ups as the 4 vs 4 modes require a healer and tank and 2 dps to participate in them. That kind of a rotation would be interesting if they could set it up occasionally.