If Nintendo were to, for example, release a core system as well as a system including two Wiimotes/chucks and Wii Sports. . .
This would work greatly against them, as they would not have a unified installment base. The idea of the Wii is to play together and get nongamers into the fray. You don't do this by confusing that target consumer with multiple bundles or packages, ESPECIALLY if one is deemed an "idiot pack", which I doubt Nintendo would do even if they did.
Nintendo would best benefit from either bundling or not bundling. Not both.