It’s possible to hook up four GameCube controllers, and four Wii-remotes and use them simultaneously, so Super Smash Bros. Brawl could support eight players. Well nothing at the DOJO leads us to believe that that’s the case, but that doesn’t mean it couldn’t happen. There no information that more than four players are even available in the games online modes. I think to myself, that shouldn’t be; with a game that is supposed to have everything taken into account, why wont more than four players be supported.
The only reason that this will not happen, other than the developers didn’t think of it, would be that Masahiro Sakurai would want all players to have a choice between any control scheme they prefer.
Super Smash Bros. Brawl will definitely require a system update check, so theres no reason that the update on the disc couldn’t add support for three more Wii-motes that would utilize the 15 player scheme for controller identification. So if you have seven Wii-motes, and four GameCube controllers you could have a total of eleven players, doesn’t that sound cool? Wouldn’t you want that instead of the player rotation system that in Brawl?