Gimmick? I don't know. I just can't see it that way. And for a gimmick, it sure it holding strong. Its ability to play classic games from previous consoles and its 100% backwards compatibility with GameCube games, I feel it deserves a lot more credit than many of the doubters give it. Things like the Wii fit are are really great ideas.
Sure, it is not so much your traditional gamers system, but the audience that it does reach out to, it does a dang good job of reaching out to.
However, it still has some pretty cool stuff for more traditional gamers, try playing a game like RE4 on it, I think the system has a lot of potential that they have not even begun to tap into yet, and unfortunately they may just stick to sports and part type games.
Actually, I have a friend who actually owns a Wii, and he is yet to buy a single game for it beyond Wii Sports that came with it. It is really ashame, what a waste. If there are more people who think like him and fail to see that it has the ability to do more than just play sports games. Freaken perfect for shooters.