Well can't say I wasn't one of those people. I had predicted about 6 million copies of the game sold by the end of the year (still amazing) and about a 10%-15% decrease in sales from last year's holiday season. Hey I was way off. Hell even my revised prediction of Mario (highest of 9 million but median prediction of 8.3 million) was way off.
I just think as a whole we all under estimated this holiday season and of course the power of a Mario game, still the biggest figure in gaming. Overall this holiday season was huge. Actually somewhere int eh summer of this year I made an argument that because sales were down in the middle of the year that the holiday season would be pretty big because of it. More deals would happen and more people shopping because of big game releases. Seems like I should have stuck with that prediction.