I'm a little concerned. I'm sure Wii Music will come and I'm sure it will be good, but I wonder if Nintendo is allowing too much time to pass before releasing more disruptive software? The only 100% disruptive product on the system now is WiiSports. Mario Party 8, Wario Ware, Cooking Mama and Rayman RR are filling in the gaps reasonably well, but I think there's a danger of new customers losing interest before anyone gets around to providing more software for them.
Then again, maybe I'm underestimating the power of some of these other games.