As irritating as I find it, it makes sense for Nintendo to not drop prices if they don't have to. They will lose some sales to the used market but, again, if they truly don't have to drop prices then those used sales won't seriously affect them.
The concern is if in the future the demand isn't at the same level and Nintendo can't just keep prices where they are but does anyway and suffers for that. While Nintendo knows what's going on now they have to humble and be willing to accept that this won't last forever and be willing to acknowledge when it stops working. I remember on the Cube Nintendo very often greatly overestimated the public's demand. They have a history of assuming people will buy their products "because we're Nintendo". I doubt they've learned that lesson but I HOPE they have. If they're smart and willing to learn from their mistakes they will lower the price of the Wii and offer a Player's Choice line when it becomes clear that the demand is no longer enough to justify the price.
Nintendo ALWAYS acts like they're number one, it just now doesn't seem quite so silly since they actually are.