Great idea, I'd support this completely - although it would be a shame not to have any gravity altering segments, or at the least some platform changes due to it.
I've only played a small portion of the kiosk demo of Gravity Rush, so I don't know if this would quite work, but what if the gravity constantly changed (in a rotation) throughout the match offering different platforms with each rotation? It could kind of work like a much better version of this course from Digimon Rumble Arena (sorry for the bad quality) :
I like what your saying I think it might work. Although those two games have alot in common the way you put it. I think the gravity rush stage should be combined with something that is its total opposit. They did it with Heavenly sword/Wipeout and Ape escape/ Resistance. I do like your idea I'm just saying they'll probably end up doing what I'm talking about.