It definitely has the novelty factor, just like 3DTV or Kenect.

We also haven't really used our Wii that much in recent times. We will like the odd game of Golf on it because that is still fun. And we were addicted to Wii Party for a while, but the selection of mini games became boring and repetitive after a while. The Wii really hasn't seen any triple A games released since its early days of Mario Galaxy and Sonic and Mario Olympics, and Zelda. There really hasn't been anything of note I can think of in recent times.

Compare this to the 360 and PS3 and they are both seeing some very nice releases in recent times.

Maybe Nintendo are just ditching first party Wii development early and concentrating on that horrible next console of theirs.