I can see going after them, or whomever is responsible for initiating the leak, but I find it an overreaction to shelve the movie. Also, it was a first draft. How many movies are made on a first draft? Haven't we all read books that have been made into movies, or viewed documentaries where we know everything beforehand? Why shelve it? I'm not really sure what is going on. Is QT so pissed at Bruce Dern, or Michael Madsen, or one of their agents, that he is putting Hollywood on notice that you can't trust one of these guys? Is this another publicity stunt? Maybe it wasn't that good of a script to begin with and this conveniently provides an out.
QT has never struck me as a very mature person. Some of his public displays have been rather immature. Again, something seems off to me.