Why does loaded up with debt imply interest rates will be low? Most debt is fixed-rate and not inflation-adjusted so there is a strong incentive to drive up inflation and interest rate with so much outstanding debt. This may fail in which case you get a deflationary collapse, but a priori it's not clear at all which direction things go.
If the stagflation era of the 70's is any guide, the world will undergo a significant bout of inflation to clear the plate and the holders of USD (playing the role that gold played then) will be wiped out and it will no longer be the reserve currency.
If the stagflation era of the 70's is any guide, the world will undergo a significant bout of inflation to clear the plate and the holders of USD (playing the role that gold played then) will be wiped out and it will no longer be the reserve currency.