I'd be more interested in HiME OAVs, particularly exploring Shiznat (or maybe Tate+Mai... Tatai?) post festival, Natsuki's mother finding out the first branch's goals (and her subsequent failed escape), and, most of all, a drama-filled explanation as to what happened during the LAST festival, when Mashiro won.
Hell, that last one might be worth a whole series on its own: Mai HiME in the Japan of 300 years ago...
But then, I'd settle for seeing Midori and Youko slamming the university around (and not the opposite, far from it).