Should movie makers keep improving old movies, or just make new ones?

Don't you find it annoying when directors keep updating and improving on old movies? Titanic, which wasn't filmed as a 3D movie, has now been 3Dified.

http://www.nydailynews.com/entertainment/movie-review-titanic-3d-article-1.1056711

The Godfather trilogy has been digitally remastered, and was sent out for a limited release in theaters.

http://www.hollywoodreporter.com/news/godfather-returning-theaters-francis-ford-coppola-295827

And, of course, George Lucas can't stop tinkering with his old Star Wars movies.

http://www.ames247.com/2011/09/01/star-wars-films-undergo-more-lucas-tinkering/

Shouldn't they just move on, and make new movies instead?
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