I'm not quite understanding what all the Avatar talk is about. A good amount of movies have a director's cut released on DVD/Blu Ray... but never has there been a director's cut that digitally pastes new CGI into it or digitally shifts a character's head to dodge a laser that drastically changes his character. Usually, in a director's cut, the entire theatrical movie is still there, but with some additional scenes.

The OT is an entirely different beast. I don't think anyone (well, many) would be bitching about a theatrical version release if, say, Lucas released the OT with a bunch of deleted scenes restored and NOTHING MORE. It's the fact that the changes make the movies WORSE that we want the original version in high quality.