And of course the FSA recently embarked upon a program to copy and digitize all the photos from their great project. They realized that even with archival properties of 100+ years, you are better off working with the negatives before they start to show noticeable degradation.
As anyone who works in the film industry can tell you, once you get 3-4 generations down the chain in
you have lost substantial quality - in fact my wife was telling me last night how they are now getting better quality prints by going
As well as making it much easier to do CGI work of course.