The comparison you have given isn't even making sense. By my understanding you are matching Bitcoin and Internet while Fiat Currency is matched with a fax machine, obviously if we made this comparison to be true then the fiat currency is almost ready to be obsolete which fiat won't definitely not experience. Of course a fax maxhine is already being replaced by scanners and wireless printers so you can't trust them to be here for long. While fiat currency is on a different level since almost everything dependa on its value and all countries with governments have one, expecting some mode of payment to replace its own value maker simply makes no sense.