I think at or around 7m is reasonable, but probably more. We have a weird economy right now and people's thirst for consumer electronics are being met in many many ways. Videogames used to stand out as the most fun device to buy, especially during Christmas season, but now you have so many other mediums and ways to play games and to kill time... the consumer electronic market is getting saturated. There is something for everyone.
So for that reason I wouldn't be surprised if maybe people's thirst lessens just a bit.... I would wager more than 7m, maybe more like 8-9m. I will trust Nintendo to make the most out of these times.
If anything, Nintendo is a good choice for the impulse buyers waiting for next gen and then let's not forget the kiddies.
