It's really just a simple waiting game. There is a strong need for a world reserve currency (currently filled by USD, and somewhat my EUR). Fiat currencies have a 100% failure rate
No they don't.
There are many many fiat currencies currently in existence, and those haven't failed.
Your statement boils down to "Fiat currencies that have failed have a 100% failure rate", which is content-free.
On the same basis:
"Democracies have a 100% failure rate"
Still being in existence is not proof that they will always be in existence, especially in light of hundreds that failed, versus the handful that still exist. Many of those that currently exist are extremely new too...
That applies equally well to currencies or democracies
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Commodity based currencies, on the other hand, don't fail, and just get supplanted by something better.
Many nations used to have commodity based currencies. Few (None?) do now.So either they failed, or you think the fiat currencies that replaced them were better?
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I don't know about democracies, since some failed and others have just been conquered and wiped out, but empires historically do have a 100% failure rate.
If you wait long enough, everything has a 100% failure rate, that is the point.
Eventually every star in the universe will run out of fuel.
Does that mean that stars have a 100% failure rate?