I believe this will happen. The world is moving from paper reliance to paperless systems. Usually, utility bills and other periodical bills give the customers option to get their bills via email or other electronic copies. This is the case also in online purchases. They usually just give the customers a copy of the receipts and other documents via email.
i believe too, and i see that a few country start to discuss and learn about bitcoin and if the government approve with this, then maybe the government will create their own crypto currency and maybe they will use tax for their coins. but i think its a long journey before the government start to do this and we should not worried about this.