Why not?? Paper photographs have lasted 100 years. Tintypes have lasted 100 years. Cave paintings have lasted 1000+ years.
Apples and oranges.
The people who worry the most, like the Library of Congress and worldwide banks, are not amused by the uncertainty of the current technology. On the other hand, I am sure they would not worry if they could record the billions of daily transactions with paint on cave walls. If they could.