I think it's because we already have a smash brother type like game on the ds and that is the Jump super and ultimate star series. The characters themselves are characters from Shonen Jump that battle each other in a kind of smash brotherly style against each other. Of course due to licensing issues it's near impossible to bring it over state side and such. Thankfully the ds is region free so that's not problem. : )
http://en.wikipedia.org/wiki/Jump_Super_Stars
http://en.wikipedia.org/wiki/Jump_Ultimate_Stars
Waiting...waiting...waiting...waiting patiently for MH3 : p







