The greatest loss? How about a sense of proportion?

Paedophiles and rapists have always been there, they are just better publicised nowadays. The risks aren't greater, or different, just better known.

The archive quality of books is suspect - stick to tablets of stone for real permanence. If books weren't meant to be burned, why are they made of paper? Ditto papyri.

The dinosaurs were probably pretty fed up about extinction, but they made way for the mammals. Who will we make way for? Nature will get its own back on our profligacy, and probably sooner than we think.

In a thousand years will some ant sit at an anternet terminal and bemoan the loss of humans?