In these currencies, gold will replace the guarantor of those currencies "Price" and the encryption "Blockchain" will be the criterion of transparency.
Until then, the Bitcoin is a good option against all central currencies, but it is terrible as daily use. "makes it an investment."
This is why bitcoin is great it has many of the advantages of gold with many of the advantages of fiat so I really think that once some of the problems are ironed out bitcoin will become a very popular currency in the future, so it is possible that in the future the competition about which is going to be the most popular medium of exchange is not going to be between fiat and bitcoin but between gold and bitcoin.