If FIAT Replaced the Gold Standard, Why Can’t Cryptocurrencies Replace FIAT?

History has shown that we have moved from the barter system to the gold standard and then to FIAT.  Is Cyptocuurency the next standard?

Have a look at my post, feedback appreciated, but please don't be too harsh.  I don't claim to be an economist or expert in this area.

https://urbancrypto.com/if-fiat-replaced-the-gold-standard-why-cant-cryptocurrencies-replace-fiat/