I think this is a bit too pessimistic.
Yes, US will print money to inflate debt until it can no longer do so. Yes, the realignment after it cannot get treasuries sold externalkyexternally, will be painful. But this has happened before (in the world) and will happen again. The country doesn't have to fail in the way of the USSR.
And once the dust settles the long term state will probably be better for many countries, US included. My 2c.