One thing I would like to try for some activity is a league thing kinda like what Smogon are doing with their UU Mafia here.
http://www.smogon.com/forums/showthread.php?t=3470139
Since our community is just so reliable with tournaments this will probably work better as they're no deadlines and you just battle because you want to. Offering emblems as incentives has never really worked so maybe we need something more, perhaps let the winner choose the people in the league's usertitle and signature for a month or something :s
I'm thinking having 4 people become leaders for each tier (1 NU, 1 UU, 2 OU) to start with, I can do UU, maybe we can persuade Vrai to do NU and Wolfy and someone else can take OU. Anyone would defeats all four can become the leader of the league/mafia until they're dethroned. Perhaps people will enjoy it enough to stay in this section. While something like this has been attempted before, with CBC's intimidation factor rather low atm perhaps it's a good opportunity to encourage new people to join in?
Of course someone would need to ask the admins to put up some notices around so more people see it.
Or this idea will probably end up like basically everything else...