I kinda had it with all the zombie games, L4D, project zomboid, dead island, dayz, etc... I get it, zombies are cool and all that, but this whole genre is becoming repetitive. I feel it's being over used. DayZ was quite the success for BIS but it's a whole different game... People who play DayZ don't always like Arma2 you know. Usually there's also an age gap between the DayZ players and Arma 2 players, with the Arma 2 players being a bit more mature than the Dayz players.
Most people who play dcs games like the realism level of the simulator. I don't think they are so anxious to have zombies in their sim. Also what's the challenge in dropping a CBU on a group of zombies in a town... :s Unless they suddenly start taking over tanks etc and controlling them... which they won't, since they are mindless zombies :)