first of all, dollar has no value. LOL :D
perhaps ever since it was stopped being backed by gold in early 90s.
it is a BIGGEST Ponzi scheme (or "scam" / fraud), along with all the other fiat currencies, but biggest of all of them - being the so called "global reserve currency".

Yep. we choose to give it value by using it as if it has.

IMO USD (and its clones) would simply "morph" into their Digital versions.

This is very likely but why should we use it if we agree to use our own? ;) :D