I have mixed feelings on this. The 1930s goal was to support the spread of information which the internet itself does much more efficiently than mailing objects around. Media rate is functionally a subsidy to book publishers that other shippers have to pay. When you talk about inter library loans that I totally support. I can see my fellow American asking "Why am I paying more to ship my dog food to support a random RPG publisher?".
It seems to me removing the printing of books and shifting to PDF only would be a large environmental positive. I strongly prefer physical books but the time may be coming for them to be a luxury item vs everyday one.