That is indeed looking fairly pessimistic at it.
Reaching the top 10 is currently 2.8M, but with Hajimente Wii comming up toghether with MKWii, it will be 3.2M.
That is pretty high, but Animal Crossing, Wii Sports Resort and Wii Music should all have a shot at it. Some unnanounced title could also have a shot at it, but I'm not certain what that could be from Nintendo, so that would probably have to be 3rd party.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS







