Survival….

How bout a game mode where you have a team or ten and you have to survive the waves of "zombies" or whatever for as long as you can. You level up like normal and you have towers that you need to defend but its all on one side to the map. The team size can be anything it doesn't have to be 10 but I think this would a very fun game mode. It would require a new map and ideas but let me know what you guys think?