Generic looking Korean MMORPG? I would be shocked if this got a 1/0th of the sales of World of Warcraft.
NCsoft is also trying to keep the game from being published in the US.
I don't believe Tera will "kill" WoW. However, I believe WoW's been slowly losing subs. Their revised Scroll of Resurrection has also been a source of criticism. It's more a combination of Guild Wars 2, Tera, Diablo III, and time that will probably kill WoW.
Divide by zero error? XDDDDDDDDDDDDDD