Nintendo are releasing wiimakes of their biggest GC games. This means that if F.I Super Mario Sunshine gets huge demand, they can make a Wiimake for it. So the games that increase in price will get Wiimakes, and that will lower the prices. Except for a few titles of course, like for instance Eternal Dark Ness.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS