First of all, don't forget New Super Mario Bros. Wii.
Or the Wii Vitality Sensor.
Otherwise, I can understand where you're coming from. Sequels to current generation games do not usually push consoles that much. But there are still people out there that are interested in the Wii and that would buy it for each of those games that you just talked about.
Twilight Princess might be regarded as a gamecube game, and many that might have bought a Wii for it might not have, for that reason. A Zelda developed for Wii might garner more attention, and from a different set of people.
Wii Sports Resort is everything that Wii Sports wasn't, and has already sold quite a few Wii systems.
Super Mario Galaxy... I have no idea how that is supposed to sell to new customers.
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