Again, the guy who gave me this information would know about that, he was in the marketing aspect of the company. Deciding to bring back the GC controller would be something he would be well aware of, since almost every issue from putting an item back on the market would be known by him. These issues would also have been known back in october, when I spoke with him. Sadly, my lack of a tape recorder (I was there to win a Wii and not interview marketing people about information concerning a videogame that was far off.) means that I cannot replay the exact discussion, but I remember him clearly stating that brawl would use the Wiimote.
And again, the guy was there to give 10 Wiis during a 30 minute lived television show dedicated to the Wii. They did not send Jimmy the coffee boy to do that distribution. As far as I know, at that point in time, they were sure they were gonna use the Wiimote. Unless something dramatically changed, I don't think the game will force people to buy GC controllers or classic controllers.