Reminds me of the "mini game" you have to play when you have to turn off and turn on your Genisis, N64, SNES, or NES. Guess the Wii isn't too reliable in terms of aging.
That happened to me.. Mine was badly scratched and this scratch removal cream was supposed to fix it but it still left a bunch of scratches! But, luckily, New Leaf comes out soon!
This always works for me. every disc that ever broke, and I just used tooth paste. Heck, I had a fully laser-scratched disc, used this trick 5 times, and it worked. Pfft, and they claim laser scratched discs can't be revived.