I didn't say I don't like them. If you'll recall from my review, I very much enjoyed Sports Resort, and I just bought Wii Fit Plus so I can get back into the Wii Fit groove.
However, in the case of the former, it's hard to consider it as anything but a fancy tech demo, whereas in the case of Wii Fit, you'd hardly require a development team the size of something like Mario Galaxy 2.
I don't know if Nintendo is getting smaller, per say, but I would say that they're definately fragmenting into distinct groups. The Wii Whatever group, the Zelda group, and the Mario group. Remember, they've been farming out Metroid for almost a decade now.