This is what will happen when Blizzard introduces the Death Knight Class:
1) Blizzard will make the Death Knight Class.
2) The Death Knights will be made totally overpowered.
3) Big-headed Warlocks and Rogues who aren't used to losing will cry nerf.
4) Blizzard will be forced to listen to them because 90% of the player base rolled Warlocks and Rogues to be cheap.
5) How the Death Knights will handle it.