> you skip the full statement of the economic principle at hand.
Hence "In practice".
To the meat of your argument: sure, there's no mechanism to coerce it internationally, but it's self-perpetuating. Everybody could quit using dollars tomorrow. But they won't.
> we already see the value of the dollar declining.
This is not clearly the case. Its value relative to other currencies (as of this month), while subject to cyclical fluctuations, is on par for the post-Covid cycles and higher than pre-2020 levels [0].
Hence "In practice".
To the meat of your argument: sure, there's no mechanism to coerce it internationally, but it's self-perpetuating. Everybody could quit using dollars tomorrow. But they won't.
> we already see the value of the dollar declining.
This is not clearly the case. Its value relative to other currencies (as of this month), while subject to cyclical fluctuations, is on par for the post-Covid cycles and higher than pre-2020 levels [0].
[0] https://fred.stlouisfed.org/series/DTWEXBGS