Among all the fiat currencies on earth, it'll be one of the slowest to devalue. That's precisely because of what you mentioned. It's the most widely adopted currency so will be keep artificially high in value from constant use. It's simply because most 90% of all currencies in the world are not worth the paper they are printed on.

A big devaluation (crash) in USD value would cause major global financial catastrophe. So it needs to be let down very slowly. Example to the gradual migration to decentralized open blockchain cryptocurrencies like bticoin.