I have many thoughts about it, but in this current generation not many of the "big name" game developers made squat for the Wii or DS for that matter. The industry is like follow the leader, they follow ideas other people have already nurtured. Before The Conduit, who was really giving people a lot of options in how to configure the remote for shooters? After they did it, other companies followed.
My feeling on the matter is that some companies were flat out lazy or stubborn and refuse to try anything new. Nothing can really be done about that, but the other issue was that there weren't enough of the "top guys" making Wii games. Now with the Wii U, a lot of those guys will be at least entertaining the idea of making a Wii U game and that leads to more exposure from the top and a greater chance some of them will try something neat. It also gives them an opportunity to jump into the Wii remote where they don't have a lot of experience.
I'm being optimistic, but I think there's a greater chance for something cool to come out of the next generation unlike this one.