Going back to traditional controllers would be a huge mistake IMO.
Wiimote+Nunchuk is superior to controllers; they just need to fix the ergonomics of the Wiimote, and they are done.
The problem is that games ARE DESIGNED with the XBOX 360 controller in mind, that's why it's difficult to change those controls to work with the Wiimote, but you can design virtually any game today with the Wiimote in mind, and it would work perfectly, and in most cases better than traditional controllers.
If you say you can't play Street Fighter with a Wiimote, I agree with you, but then, you can't play it either with the Xbox 360's controller, at least you CAN use the D-Pad in the Wiimote (and frankly, if you want to play that, you use an arcade stick).
If you say FPSs work better, I will just point and laugh at you and your absolute ignorance
.
If you say that platformers work better, I will point all the successful examples of platformers on the Wii and say that platformers need only a D-Pad and one button, the rest is for hardlycores (guns, etc).
If you say racers work better, I will say that yes they do, but it's not terrible or even bad with a Wiimote+Nunchuk.
The only problem I see with the Wiimote is that last gen, many games used the second stick for camera, and that is difficult to translate to the Wiimote, and I agree with you, but that is a design problem, not an input problem.
Also, I like having independent hands to play, big upgrade.