Im still hopeful we will get to 1 million in 1 year (just in USA), that is how optimist I am...
You should take into consideration this title didnt have a big budget for marketing (as an example, both Activision and EA declared that last year, between the two, they spent over 60 million dollars in advertising for Battlefield and Call of Duty, their primary shooters...).
And if youre gonna say thats shooters, lets take
Kingdoms of Amalur, EA's new fantasy RPG baby... With ALL the marketing they did (TV spots, billboards, Kurt Shilling taking advantage of his fame and appearing in prime time TV and talking about Amalur), they
only sold 330.000 copies in USA (and thats across the 3 platforms).
So... we're doing OK, I guess, considering the low marketing budget, and the fact that Witcher2 IS a complex game, not for the casual gamer indeed...