It won't beat Sm64 in Japan? Why? It has sold 870K, with good legs, while Sm64 had 1M in the same time... Sm64 sold 23k in its 12th week. SMG sold 16k and it is Januray. I'd say that is pretty much the same.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS