Sure for the common folk the wii is a new experience...but for internet nerds and the like like us--I think it's going to take a whole lot more convincing.
I played the Xavix version of tennis, bowling, fishing, and baseball, and I can't say it was much different from Wii sports. To tell you the truth, it was almost identical, albeit with worse graphics. And 90 - 95% of the annecdotal reports of people's families being enamored with this freshness comes in the form of them picking up and playing Wii sports. Sure, those type of experiences seem to map well physically with the controller motions because they are physically natured games, but what happens when motions on-screen don't practically map with the physical controls that you have to input on the Wii-mote end? I don't think it will be anymore intuitive or familiar at that point than using an ordinary controller. At that point, the motion you'd be using would be just as much a broken, confusing metaphor as a color-coated button with a letter or shape on it, except with a less efficient keystroke. So far my favorite part about the Wii is the sense of nestalgia it conjurs up, when games were more innocent, less violent, and more based on imaginitive fantasy themes.
All that being said, I'm still not 100 % impressed with the motion controls as of yet. My other gripe (besides metaphor for use) is performance. They seem to be laggy, which sucks.
I'd really like to see a game where the controller brings you in in a whole new way...where it feels natural, yet it doesn't feel like playing the same game in a different way; rather, it feels like playing a brand new game in a brand new way.