Before Bitcoin appeared, we seldom doubt the reasonability of currency.
As a matter of fact, wealthy entities did that, hence they kept their funds "locked" in gold, art, properties, ... name it.
Wealthy entities and even banks do that,,, exactly. Fiat, although a creation of banking states, was very weak in the structural foundation and although always known, it was publicly exposed globally in the last big bank crisis. Fiat cannot be sustainable and last two years, if you pay attention, banks are buying back all customers gold and even forcing them to give them up,,, at best returning "certs" which is like fiat backed with a promise of gold.
When they realize Bitcoin is a better way to lock up money, they will start buying big!
Yes, more and more groups are choosing to embrace Bitcoin and abandon fiat currency. This is determined by everyone's basic interests.