I've avoided picking up some movies on disc because I felt sure they would be released in more elaborate sets. As an example, there is the new Gone With the Wind - 4 disc Collector's Edition.
While I wouldn't wait for any movie, some are standards and "must have's" for anyone who collects. While the earlier disc was very good, the latest (this big collector's package) has an even cleaner image plus oodles of additional material.
Of course, the best part is the film. It's a dandy.