Look at it this way: Nintendo has made at least 8 evergreen titles so far this generation (Nintendogs, Wii Play, New Super Mario Bros, Brain Training, More Brain Training, Mario Kart DS, Wii Fit, and Mario Kart Wii), with at least 1 up for debate due to pack-in status (Wii Sports). Of those, how many can you profess to have purchased and played? If the answer is less than 4, then I don't think you're exactly qualified to be making accurate estimates on the "evergreen factor" of Wii Music.
Any less than half of those games having been properly observed indicates a lack of solid understanding in what makes the games appealing, which is only expounded upon when you don't understand how they're still selling so well. To understand a market trend, you must observe the market trend from either a neutral or outsider standpoint, and not from an intentionally contrarian one. Going into anything with expectations counter to reality is a surefire path to problems.
Before you analyze a market trend and decide what fits into it, make sure you understand the market trend itself. That's all.
Sky Render - Sanity is for the weak.
