Fiat will eventually fail. The problem is they're trying to use inflation to "inflate away" the debt, but actual markets can only deal with that for so long. They have the money printer; we don't.
This is such baseless I mean if fiat fails what will replace it and why do fiat will even fail in the first place? You may say a particular currency is failing which we have seen in the past but don't generalize fiat and as long as country is ruled by government and not by crypto enthusiast. Let's say even if fiat is replaced by something else what would and who would replace fiat and how it's value will be measured? What will be the holding which guarantees the value of post fiat era? Let's not spread too much of negativity and yeah USD's dominance will be reduced especially after what's cooking up with BRICS nations about using their local currency for trade.