Data that stays "live", that people are interested in, remains accessible - if a torrent stays seeded, it doesn't matter that it's now on SSD rather than magnetic hard disk. And digital media makes copying really cheap. When I meet up with my friends for a LAN party we sync photo libraries - even the most prolific photographers only have a few gigabytes, so it's easy for everyone to act as a backup for everyone else.
If there are some pictures you care about, save your own copy, or several copies of them.
Pictures that no-one cares about? They may die, but that happens to any data that no-one cares about. The same kind of "photos at the bottom of a drawer" phenomenon can happen with digital too - I've read stories of family photos accidentally packaged into software releases, or of people discovering unexpected things in a backup of a backup of a backup that was just copied around for years without anyone looking inside it. But the vast majority of physical photos are lost, just as the vast majority of digital ones will be.
If there are some pictures you care about, save your own copy, or several copies of them.
Pictures that no-one cares about? They may die, but that happens to any data that no-one cares about. The same kind of "photos at the bottom of a drawer" phenomenon can happen with digital too - I've read stories of family photos accidentally packaged into software releases, or of people discovering unexpected things in a backup of a backup of a backup that was just copied around for years without anyone looking inside it. But the vast majority of physical photos are lost, just as the vast majority of digital ones will be.