Sure, that's what we are aiming for with crypto currencies. But we got no practical way to do this today, the easiest way is to use a debit card that you load with bitcoin which turns into cash. But the fees for withdrawal and usage is to high to make them viable for everyday usage. But in the future i hope we will have a option to do so, to use bitcoin as i use my countries currency.
I will check out the book, thanks for the comment. :)