Before Fiat was barter! People did not immediately begin to perceive paper as money! But nevertheless it happened... That bitcoin, and cryptocurrency in general, have to go this difficult, long way! I'm the one who believes it, and I feel it in my gut.
Very old period of time, people used Barter, even my grandfather has also not seen barter system, it was too much old period.
But you are right, fiat overcome on barter and before 10 years people believe only two things fiat vs Gold, but now Bitcoin is also include in it. The surprising thing is, bitcoin get success more than fiat and gold and also in future bitcoin will be overcome on them.