If that time ever comes, it will be because of a collapse in the US economy to such an extent that foreigners no longer want to hold claims against it. At that

If that time ever comes, it will be because of a collapse in the US economy to such an extent that foreigners no longer want to hold claims against it. At that point it doesn’t matter what nominal interest rates are, because it simply won’t matter. Many get the causality backwards, thinking that inflation causes economic collapse, but the former is actually the consequence of the latter.