We will write books because it will be necessary then...
The chances of a natural occurring event to wipe out every single city in the world is pretty low...To worry about such an event is borderline paranoia...
I don't think it's justification for keeping the library status quo...
All books should be transcribed to e-Books, and libraries need to become like technology centres...Get rid of the racks, to make more space for computers and other interactive technological gadgets...
For example, a robotic mannequin who can interactively teach children/anyone the human anatomy, an interactive world map or globe that can teach children/anyone about other countries, interactive encyclopaedias that can take you through journey through Peru during the height of Inca empire, and other things of that nature...
Let's embrace the future...
You can have "tech libraries" and "libraries" at the same time. They aren't exclusive. You want us to embrace a future where we have no control which is obviously dumb.