I agree they should do it to spur slow sales... But I also think it should be done to Increase sales on a worldwide level as well as increase base demand. Something simple like a bundle with Dead Space Extraction or RE: Darkside chronicles would do a big part in helping Third party titles get much needed visibility.
Games like Endless Ocean with a cool blue Wii, Dynamic Slash w/ Motion Plus and the Red to match the box, Sin & Punishment in White, Monster Hunter in the west with a Gigantic Lagia Crus on the side.
And THE HOLY GRAIL. The Legend of Zelda: KickAssBusters in Gold, maybe with the Master Sword and shield combo on the side... a la the following Case Mod
http://kotaku.com/245061/the-only-zelda-wii-case-mod-youll-ever-need