Like I said at the start many countries would love to have this problem nothing to worry about at allAnd even then they ran into trouble with their own debt ceiling.
Anyway, out of our $3 trillion currency reserves, only about $1 trillion of that is in US debt.
It's extremely unlikely for the American economy to collapse in the near future, so I'm not too worried.
And even IF it happened, the leftover $2 trillion would still be the largest currency reserves on Earth by a very large margin.