Vulture.com has an interesting read about the future and troubles of switching to an all digital movie industry which is currently at about 90% saturation.
A quote from the article:
In one of the most famous examples of the perils of digital preservation, when the makers of Toy Story attempted to put their film out on DVD a few years after its release, they discovered that much of the original digital files of the film â€” as much as a fifth â€” had been corrupted. They wound up having to use a film print for the DVD. â€œThat was the first major episode to draw public attention to the fact that digital files are a challenge when it comes to conservation,â€ says Usai. (Somewhat hilariously and almost tragically, a similar fate came close to befalling Toy Story 2, which nearly got nuked when someone accidentally hit a â€œdeleteâ€ button.)