Why is a Charles/Erik retread a bad thing? They handled it incredibly well in FC and really fleshed it out. Despite loving X-Men and X2 for what they are, the most interesting part of the whole film series for me is now Charles and Erik's frenemance. The characters in the old movie strike me as flat in comparison. Honestly I find them so interesting that if they did a whole movie for them devoid of explosions and powers, I'd watch it. I can't say that for any of the other characters. What is it you're hoping to see in the next film (be it FC 2 or X4)?