Of course it can. The only reason such a large part of the debt was in foreign currency was exactly because creditors didn't have confidence that the Central Bank wouldn't inflate the debt away if it was held in national currency.
Agreed. So in order for the Latin American countries to finance trade deficits, they have to borrow foreign currency in increasingly larger amounts on increasingly bad terms.
That's why I mentioned earlier that the whole thing depends on the confidence on the system. The US enjoys the greatest creditor confidence of any country on Earth.
The USA is still able to export dollars and T-Bills and stock to fund trade deficits. People in the world still generally trust US Dollars.
Should it pursue irresponsible policies for what is perceived to be an excessive amount of time, such confidence will erode and you will have to take debt on foreign currency as well. People don't loan to the US on dollars and for cheap because they like the food, they do it because the country never defaulted and has generally kept conservative policies.
Here is another problem: If you sit on a pile of hundreds of billions of dollars in cash and T-Bills and T-Bonds, the value will be there as long as there is confidence. If you lose said confidence and dump them, then their value will erode. You can call this a game of confidence or a game of chicken.
So if the USA continues what you call irresponsible policies for what you perceive to be an excessive amount of time, the question is, will you continue to buy US dollars and keep the confidence game up; or will you sell your pile of US dollars?
What I have trouble understanding is the expected real rate of return on a 10-year Treasury bond.