Well the thing is, Nintendo plans on catching up with demand by April of 2008.
So if they manage to do that, and ship out 3-4 million units like mentioned above, we may see a cut. If that doesn't happen we won't.
Nintendo is aiming for April though, we should wait to see if it happens.
If not, a price cut will come, much earlier than its third year like someone stated previously. I would say closer to the end of next year is when the price will go down, especially if people are not looking for one as badly as they were this year, they will need to do something to garner interest if need be, so a price cut would seem fitting in that case.