Numerous reasons why people should use have already been mentioned. So I think the next question would be: why should people use fiat?
I think that because of simplicity, the appeal of Fiat will be more or less popular, and one should take into account that the user must have education.
Fiat is the currency used today. You certainly can not put aside . is a novelty, so of course fiat is now superior to . But as time progresses it will change.
I don't think will change the world and replace fiat system, as long as the government are supporting it, this will stay in circulation. Right now, fiat is widely use by all people and takes only a little portion of the population and take note, this users are fiat users as well.
fait has its own importance and i don't think no one can replace its importance. the only way any cryptocurrency can replace it is by if all the world should be digital and there will be no concept of fait money and all you use cryptocurrency for the exchange of goods. no one know what would happen in future.