Never in a million years.
I love Call of Duty, don't get me wrong. The series is known for it's addictive multi player modes and cinematic single player campaigns. But (and I'm probably on the only guy on WZ forums who feels this way) I absolutely cannot stand Nazi Zombies. It bores the shit out of me because it's the same old thing over and over again and if I wanted to play online Call of Duty with my friends, I'd just slip into a game of Free For All or Domination and play that. I'd never buy a game purely based around that mode because it's so limited. Infact for the most part, I've never liked games where all you do is shoot Zombies (Resident Evil 4 is the only exception but that's because it combines that aspect with an amazing story and a great adventure to go along with it), I just find it dull. Just not my cup of tea.