Somehow I get the feeling, that even if they manage to turn the academy's view of beta students around, there is still the world around. The other academy would just barge in and claim, that this academy got weak. It's like to try to dig your way out of a literal shithole. Even if you shovel the shit aside, new shit just comes tumbling down and take its place. In the end you only manage to dig yourself deeper into shit. And face it, this seems to be a rather shitty shit world with majorly shitbags as population.
Sad and slightly funny enough, that shadow world incident seem to be the only think capable enough to handle this problem (in the end by wiping out everyone). The "normal" or common magicians, think of themselves as weak and would thread carefully (a good thing, most would still die, but they maximize their survival rate), while the strong royal blooded bastards would head into their end. Only the strongest and most capable survive, with wouldn't only be nobles. Without society, there wouldn't be something like a noble status left, to begin with. End of discrimination.