This Penny Arcade comic answers "Why?" when dealing with media pretty conclusively:
http://www.penny-arcade.com/view.php...00-10-23&res=l
Besides, Hollywood wouldn't be Hollywood if they could leave a perfectly fine thing alone. That would just be wrong. Anything with a budget bigger than about 20 million $ is destined to have a sequel at one point, for no particular reason.
Gatac
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Katy: Can I have the skill 'drive car off bridge and have parachute handy'?
Justin: It's kind of a limited skill.
Greg: Depends on how often you drive off bridges.
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