you can physically print bitcoins if you wanted onto paper, it would just be the QR code on a piece of paper with the amount of the bitcoin the QR code holds and represents. By why waste the plastic (like the cdn dollar) or paper... we live in the digital age digital gangsters keep it digital. I mean it would help in the future if the main power grid went out or something.
You can print it by yourself but banks cannot because it isnt approved by governments that bitcoin should be printed and to be used just like a normal paper money but you still got a point when you say that we are now in digital world . everything now works in digital and the best part is that we can save our trees and we can save the environment when we arent printing a paper money .
In case of blackout . there are still generator that can power our gadget using a fuel