It's more likely than you think.
I haven't played my Wii in a while, as in actually playing a disc game on it. Probably about a month or so. I went to play Wii sports today, and it said it couldn't read the disc. I swore loudly to myself, knowing what this probably meant, before ejecting the disc, checking for scratches/dust, etc. and reinserting it. Still no luck. I tried another Wii game. Same thing. Tried a Gamecube game. Same thing. Swore more loudly.
So now I'm going to call Nintendo tomorrow afternoon, see what I can do. At least I'm still under warranty. =/