So?
Why should anyone have almost perpetual* control over something he thought up one day?
14 years is more than enough to make money off the movie, and after that there is nothing stopping you from making more movies about it.
Get a trademark for the "Star Wars" name if you don't want others using it. Also, Disney doesn't get to "take" anything.
Sure they could make a remake or whatever after 14 years, but then again, so could the original creator.
* I know that 70 years after death isn't perpetual, but it might as well be since everyone who was alive when that IP was released will be dead when it comes out of copyright.