> How do you think those debts will be payed down?
The US debt-to-GDP ratio is a bit over 100%.
With my mortgage, mine's higher than that, and I don't have a central bank under my control to tinker with things. No one questions my ability to pay off my thirty year loans; current interest rates on US debt indicate no one seriously believes your assertion that a US default is at all likely, let alone probable.
(Argentina's bond rate is 75.00%, reflecting their history of default and likelihood it'll continue. The US borrows at 2.90% right now.)
When my mortgage is mostly paid down, I'm likely to refinance and take on additional debt, perhaps for home improvements or a newer house. Just like the US does as it makes its debt payments.