They cant pay with money that has no value , the peso ………I mean dollar crashes , its worthless outside its own country . Its beyond repayment now as it is . THat means one of two things when it comes to a superpower ……………and yes we still are a super power , but now more like a Soviet style superpower , which means only because we have nuclear weapons and the ability to deliver them world wide . But I digress , its beyond repayment now , that means to the lender , the debt or a large part of it will have to be forgiven in order for repayment to be possible , or accept that it will not be possible and continue to lend in order to avoid crashing their own economy ………… The petro dollar is going away , it has to , because the petroleum its based on is a finite thing , and a consumable thing ……once used its gone . Countries like China and Russia are buying up large amounts of gold , we dont have a back up currency medium .