We are comparing currencies, not tools. And the facts are on my side, intrinsic currencies tend to be much longer lasting than their fiat counter parts. But, yes, I do agree- the authors claim of 2600 year stability based on the age of a coin was not good. However, there are many empires that lasted several hundred years with gold and silver as their currency.
No fiat currency matches its population. It is designed to create booms and overspends, always. Just look at the debt clocks from around the world; those numbers are going up WAY faster than their respective populations. And their buying power is dropping in kind.