In my opinion, right now it's impossible for Crypto to replace fiat, because fiat are running for a long time, and some big countries already ban Bitcoin. But in the future, it's possible, electronic money will replace fiat, but it will take a long time, before that happen. For now it's impossible, because Cryptocurrencies are still not trendy to other people.
Right now it is impossible for any form of electronic money to replace fiat since fiat exist not only in electronic form but in the form of cash as well, that is why I think that if in the future we want to replace fiat it will need to be with a combination of bitcoin, gold and silver, we will use gold and silver for those that want a physical element and for those that can accept an electronic form of payment we will use bitcoin and other cryptocurrencies.
- And if from what you say, fiat has become quite complete, why do we need replacements here, replacing with a combination of bitcoin, gold and silver or anything else, it also can not produce a good result for the future. The society with fiat is moving very steady, with no complaints, so I have reason to believe that fiat will still play an important role in the future, crypto will have no chance to touch the fiat's position because from the actual situation, it is not welcome, support and stability are still very low