In my experience, this is one of the reasons for using film that a lot of people understand. When I say "you can leave the negatives in a shoebox for fifty years and then someone finds them in the attic and they're still good", that makes perfect sense to almost everybody (the exceptions are the ones with an excessive faith in cloud storage).

Pity about that C-41 exception---it's one of the reasons I don't shoot it much. I think I remember, though, PE saying that the longevity of modern C-41 materials was enormously improved; not to Kodachrome levels or anything, but enough to make a meaningful difference in terms of the transgenerational shoebox.