Hmm… well…
To have the X-Men essentially broken, seeking out their mentor to bring him back to Earth, expecting his return will fix all their problems… only to have him be like, “Sorry, kids. School’s out. I can throw you some advice here and there, but it’s your mess now. You clean it up.” That would be fucking gold. Come on, Netflix. Make this happen. You raised Full House’s diabetic corpse from the dead. There has to be something you can do about this!