What is your position about a "cure" for being a mutant? This is a work of fiction, but if being a mutant is down to your DNA I don't think that a "cure" should exist anymore than there should be something that makes everyone's eyes the same color.
Gases, inhibitor collars, viruses, and a shot that makes you "normal" just shouldn't be so easy. I know it's all BS anyway to give another threat to mutants, but it seems like an easy cop out. At any given moment there might not be mutants...this happens about every 5 years and it's boring.