What people tend to forget is Hollywood is all about $$$$ first and artistic credibility second. Hence why movies like T3, Freddy vs Jason, AvP get made with different directors than the originals. You think studio Exec's care about the stories/characters we love? You think they care about preserving the feel of the previous films? As long as they can make a profit on a movie franchise/someone's vision (eg Cameron's "Terminator") they will do anything to make it happen.
Look at George Lucas and Lucasfilm. There's all the evidence you need about the relationship between studio executives and the artist.