I must confess, it would be rather interesting to have the vitality sensor, but if such a thing were to be employed onto Zelda Wii, then that would be a different story. For starter, this thing clips on your finger and resembles the same thing you find in hospitals. Because of that, it would make it a little more difficult to control. (i.e. trying to press C, Z, and
Plus, I don't want that clipped onto my finger for five hours while I try to play Zelda. A design that I actually found interesting (yet never used it) was the Vitality Sensor for the N64. This vitality sensor clipped onto the ear instead of the finger, so it is out of the way.
However, you could imagine what could happen with this system, though. For the N64, the vitality sensor was used on only one game: the Japanese version of Tetris 64. Whenever your heart rate increased or decreased, that would alter the tempo of the game. Perhaps if they incorprated such technology into Zelda Wii, they could have Link's attack strength varying from heart rate, or certain monsters could smell Link's "fear." Perhaps when the player is nervous, Link can't stay balanced on a rope or something. It is a very interesting concept that we can all throw around.
However, the only problem is that we have this thing on our finger...this big, pinching, C, Z, B preventing thing on our finger. If they moved it up to the ear or something, then yeah, I wouldn't mind wearing it for five hours (as long as it wasn't a massive pinch) to enhance my gameplay. Plus, as long as they don't put that saddle controller they patented to use, I'm fine.