Film may last longer than the hardware used for delivering DCPs, but that's surely a matter of optimizing costs. The DCP delivered to a theater is not intended

Film may last longer than the hardware used for delivering DCPs, but that's surely a matter of optimizing costs. The DCP delivered to a theater is not intended to be archival. Indeed, given that it's lossily compressed (via JPEG 2000, of all things), it's not even appropriate for an archive. What should be archived instead is the DCDM, which is uncompressed and unencrypted. And it shouldn't be archived on a mechanical HDD which will obviously fail within 10 years. But I digress. The point is that we have better long-term storage options than HDDs; they just wouldn't be economical for delivering content to theaters. There just isn't any reason for archiving and delivery to be coupled.