Looking at this from another angle, digital media does not have a good record for longevity. Hard disc crashes, technological obsolescence, and the like tend to lose a lot of pictures. I have heard stories of baby pictures lost forever to a computer crash or virus attack.
So in that light you might do well to make good quality pigmented prints of your most treasured images. Printed images will make it into the future simply by being stored in a safe place. For digital media you need to repeatedly copy your images to new media before the old media, obsolescent media becomes impossible to read. I'm thinking about that drawer of decade-old backup tapes that I am sure can no longer be recovered by any reasonable means. But my family snapshot prints from that time survive quite nicely. And the old 16mm family movies from the 30's still look good, try reading your DVD in 2090.
That is a legitimate concern, but easily circumvented. Just copy all your old files to your new computer. Disk space is so cheap these days there should be no excuse not to. If you rely on a DVD to be read in 80 years (or even
, you're doing it wrong. Just roll everything to HDDs, SSD, holographic memory or whatever is the most cost-efficient way to keep your photo backups current.
I have an acquaintance who lost the photos of the first 5 years of his first kid's life to a virus. Must have been devastating. I bet he backups now.
The problem with prints and albums is they deteriorate with time (admittedly not much if kept well), and one fire, theft, or broken water pipe will render them useless. Multiple backups, at least one of them offline and offsite, will give several copies of the same files without any deterioration in quality.
The biggest threats are proprietary formats such as .cr2, .nef and .dng - although the latter seems quite future-proof from what I've read. There is no guarantee they can be read in the future, and it is important to remember to convert all your files to whatever is the standard format when they die.