I don't think that it would be possible in future, even though cryptocurrency has been used by so many people around the world, even though it is really helpful for everyone who is using it, it cannot still be a standard currency in the future because as what we all know it is decentralized, which means it cannot be handled by the government and its volatility makes it not suitable to be used for daily lives.
I think cryptocurrency is only good as an alternative currency for fiat currency, it is meant to be converted to fiat currency whenever we want to.
Most likely, everything will be so, the main property of any currency is stability, when both the buyer and the seller know the approximate cost without additional sources. And with cryptocurrencies there can be very strong fluctuations, and without tracking the course for a couple of days, you can lose a lot.