There's a flip side, though: digital material is also easier to copy than physical material. This means copies are more likely to get made, which means it's less likely that the loss of any one copy will totally remove the material from the historical record.
And you won't have boxes of super-8 film in your basement slowly rotting because no one has the time to encode them to a digital media. My family has tons of super-8, VHS and simple photos which will, in all likelihood, rot into nothingness because no one will fish them out of the basement in time.
There are problems with digital media (e.g. easy to lose it all if you don't have a good backup scheme, or don't continually keep up with current formats). But its easier that physically copying old media.
