I think it can definitely pass 1 million, which for a early title should be good. 3 million is a definate lifetime possibility.
Don't forget that Nintendo gets more money per game sold than say, Ubisoft gets. As such this game does not need to sell as much to be a success.
The Democratic Nintendo fan....is that a paradox? I'm fond of one of the more conservative companies in the industry, but I vote Liberally and view myself that way 90% of the time?