Fiat money is money that is guaranteed to the State, of course I never hesitate. the use of the bitcoin I think only as an alternative, fiat money is still the largest and can not replace by any included bitcoin.
See, that's sort of the problem with fiat. Only the government owns it and they are the only one that gives value to it. When they decided to pull out fiat, all of the fiat money that's with you will become valueless. And by valueless I mean like zero value. No one will accept your fiat anymore. This rarely happens and I'm not sure if this has happened before. What you should look up to is when your fiat gets devaluated and even trillion worth of your local fiat is not worth anything anymore. That can happen.
When you're using bitcoins, you're free from that issue. Even if your local fiat gets valueless, it's alright since you can exchange your bitcoins to any other fiat currency.
I any devaluation of the national currency is possible, and sometimes this is the case. Why us should not be focused on all currencies. We take the market leaders not only demand but. The dollar and the euro are very strong and durable. Dollar supported by not only the US but also international financial institutions.