Gregory's ServerOh definitely not arguing that at any point my digital movies *could* disappear, that's why I buy physical. But, just mentioning that it has not happen since I started collecting movies and it's been a long time.
I do want the movie studios to be more like music studios -- when I buy digital music, I'm good with it because I can download it DRM-free in FLAC and I own that copy. Movies should be the same way.