Pro-reserve argument such as it is, is that the day will come when the trading partners of the US government won't accept dollars BUT accept bitcoins/cardano/so

Pro-reserve argument such as it is, is that the day will come when the trading partners of the US government won't accept dollars BUT accept bitcoins/cardano/solana/whatever? The former is definitely coming on accelerated schedule, but why would the latter ever come? The new industrial and trading hegemon (aka China) would demand trading in the currency under its sole control, and by proxy, that's what everyone will end up trading in.