The point of pegging a currency to something tangible, like gold, is to increase confidence in the currency. When the currency is pegged, it's much harder to just print money whenever the government wants to. Thus, pegged currencies are safe to do business in because they just won't evaporate overnight.
Remember: Currencies come and go, so the dollars, Euro, Yen, ect, will eventually be replaced by something else. Given the US Dollar's status as a reserve currency, it probably won't just "collapse any year now".
I'm currently reading "Principles for Dealing with the Changing World Order: Why Nations Succeed and Fail", https://www.amazon.com/Changing-World-Order-Nations-Succeed/... The author, Ray Dalio, carefully explains the signs of when a currency is going to fail.
Takes a look at historical ups and downs and gives hard data without too much colour being added.
[1] https://www.amazon.com/Changing-World-Order-Nations-Succeed/...
The same things that are happening now have happened before -- just not in our lifetimes. The history and his analysis is quite instructive.
The book was refreshing in its objectivity, lack of political bias, and clarity of writing. I've given copies to several friends.
It's pretty clear from his analysis and the data that the U.S. is in a decline of global influence.
https://www.amazon.com/Changing-World-Order-Nations-Succeed/...
[1] https://www.youtube.com/watch?v=TISMidxdZoc
[2] https://www.amazon.ca/Changing-World-Order-Nations-Succeed/d...