The question is really; can ToS 2 come close to 750K in Japan LTD?
Dragon Quest Swords sold more than 500K, so 500K should be possible (and fairly easy).
I'd say that lifetime, it has a shot.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS







