Look at what happening around. The first cryptocurrency bitcoin was invented to reduce the hassle of third party and have borderless transaction. Isn't it true? Now, look at what happening. People are more into investing it than using it as currency.
Most interesting is people are most interested in coin which give more ROI, they are not interested in the currency-ish of a currency.
For example, some people are talking a lot about BSV, but if they have some research, they will never take it as currency, but as this is giving a good return now, it's best for them. Why man? Why don't we look into a decentralized coin? Why do we only take it as investment? Did Satoshi ever take it as investment? Or he invented Bitcoin for borderless payment and solution to the intermediaries problem?
For now, surely the cryptocurrency is not yet tending to replace the fiat currency since fiat currency is still the circulating currency and it is the main currency of all of the countries, circulated by the central banks and already recognized by the community. Comparing it to bitcoin where there is still a small percentage that trusted bitcoin as a currency. A lot of people still don't trust bitcoin afraid that it is just some kind of scam or pyramiding scheme. I think bitcoin was still a great choice for just an alternative for fiat money for online use and also an alternative payment option for everyone, but surely we never know what is going to happened in the coming years I can't really imagine how bitcoin is going to be a currency that the government is going to use as the main currency but I think adjustments could go in the future.