Yes I agree it seems more fitting but it is to close to the suicide commited in X2. I think it will be more dramatic and tear jerking if the X-men was force to kill her themselves. All of them working together to do so. I brought up the cure because even though it is a dull way to end a movie. It is the most practicle and logical option. Unanswered ends or where would jean really doesn't matter. I'm sure all the mutants have a personal lives. Jean is a doctor. Maybe she can do that full time .