The pay off for converting to digital projection only benefits the movie producers, not for theater owners. There are theaters that have projectors that are decades old and are perfectly good. I have a feeling that with digital projection, theaters will have to bear the cost of short hardware upgrade cycles and constant upgrades in software. This trend can endanger small art movie houses. The little guy that cares about movies shot on film will get the shaft like independent book sellers that can't sell Ebooks.
Take a look at this: