Wow, what an argument. There is a middle ground, and I think the truth is in it.
Madden didn't sell very well this month on the Wii. That's a fact. But I don't see how that leads to any certain conclusions about the Wii's demographic, not even the obvious one, which would be that people who buy Madden don't own a Wii. So the question is, why didn't it sell, right?
Reverse the question. Why should it sell? If you're a Madden fan who buys it every year, and now you own a Wii, why should you now buy it for the Wii instead of your old PS2 or Xbox? I can see why Madden fans who now own a 360 or PS3 would move over--the obvious upgrades there. But has EA done anything to show that the Wii version would be better than the PS2 version, for example? Madden fans might feel more comfortable sticking with the familiar PS2 controls.
Apply the same question to the Tiger Woods game--another game that sells a new version every year. I think the answer does change--there is a good reason to buy the Wii version, and it's packed in with the Wii. Golf obviously is fun to play with motion controls--or at least people who've bought the Wii think so.
Now what about all those Wii owners who are supposed to be new to gaming? Why didn't they buy Madden? Ask the same question: why should they? They've lived without videogame football their whole life. Why did they buy a Wii? I imagine they either tried it and liked it, or heard that it was fun. Neither of these would apply to Madden--yet. It could. Maybe it'll click with people who have bought it, and word will spread--but that didn't happen the last 2 years. I know they've re-tooled it, and specifically for these people, apparently (another reason why Madden fans might steer clear). But I see no reason a new Wii gamer would buy Madden on Madden Day.