True, Cable is a stupidly convoluted character, but he could be streamlined very easily. Drop the whole "sickly son of Scott Summers and Madelyne Pryor who was sent into the future to save his life" thing, and make him part of a futuristic genetic experiment that created two twin babies: one flawed (Cable) and one perfect (Stryfe). The perfect one was raised / twisted by a warlord (Apocalypse), and the flawed one was disposed of and found by a resistance group / cult that raised him to fight said warlord. Drop in some time travel, smart writing, religious overtones and lots of explosions, and Cable could be a new franchise akin to The Terminator. Plus, if done as a trilogy, imagine the cliffhanger to the second film as Stryfe removes his helmet to reveal his true face.