Well, there have been a lot more than 15 of them, and that's just one series! Konami's Bemani series of games incorporates a lot more than DDR... Drummania, Beatmania, Guitar Freaks, etc. And that's just Konami!
I can see why people would be tired of the genre in general. But I don't see the big deal in putting Mario in a DDR game.
On the other hand, it would probably be better if Nintendo could get a real DDR on one of their systems, for once.
Bah, using resources against me. I know there are a bunch, but most of them arent that different. I dont concider Beatmania, Guitar Freaks ect as dancing games, because they arent, they are music/rythm games. If you want to get really technical, I could find the list of all the DDR knockoffs, but that would be overkill.
I didn't mean to come off as a personal attack, Stingray, and I can understand that not everyone finds the games fun.