Well seeing as how the Wiimote is intergrated into everything (not just sword-fighting), I think your thinking style is pretty....well, naive.
It's naive to think that this is just some dungeon and not a new control scheme. This isn't a new title, this is Zelda TP. Honestly, do you think Nintendo can develop TP, PH, and this new title while juggling the rest of their duties. That's high unlikely.
Also, I wouldn't put it past Nintendo to make this a full-fledged Wii game. Sure that's shady, and I would be pretty pissed as well, but then again I am buying a Wii so my anger only goes so far. However, Miyamoto has stated it over and over again: TP is a Gamecube title, and as such, it will play with a gamecube controller. So like Bill said, you don't have to play it with the Wiimote.
(Though why the hell not? Your crazy if you don't realize the potential here)