Why are there so many people eager to look stupid with things like that? At least it's entertaining.
Let's ge on with it:
1. So Nintendo sells everything they make, forcing the competition to drop price below the Wii price to be relevant, and Nintendo is the one that needs to worry? Stupid people define the public behaviour, when obviously Nintendo is far better than them at knowing what the public at large want. Unfortunately, the author's pipe dream is far from reality: a "hockey mom" won't buy a XB360 because she can't find a Wii, that's nonsense. It's so obvious nonsense that I sometimes wonder if these people are not stupid.
2. Shortages of the Wii didn't help the competitors much in the past, so with the production of Wii now being up, it won't change anything at all now. Besides, this time around, I think Nintendo built a big stack of Wii for the holidays. Can they sell 3 millions Wii in a month? We'll see, but clearly, that's not sth that worries Nintendo.
3. Hardcore gamers are not what makes the Wii a success. Another pipe dream, that hardcore gamers are relevant enough to be the savior of any console. Anyway, they're not what makes a console a failure, though they're needed as early adopters. They're surely no reason for Nintendo to worry.
So Nintendo doesn't need to worry about any of these points.