Borrow money until we no longer can, enter hyperinflation, pay the debt back in full, and finally, create a new currency. 

The biggest collapse in the world will be when the world reserve currency fails, which is currently the USD.

I also think that having reserves in a depreciating currency long term isn’t that smart play so I would maybe even hold reserves in something like gold and silver so you hedge your reserves against inflation.

Finance it, manage it, hold it, then let the politicians and bankers erode the currency. 

I have reserves in both currencies. 6 months in AUD, a little bit more in USD. 

The US is on a ride that will end some day in a major way.We cannot keep printing money to pay for the costs of the money already printed and sold via bonds/treasuries if the value of our currency moves down without printing tons more money which in itself will devalue the currency...

Imagine if we were trading stocks or currency and all we did was talk about the magic and positives of margin trading, without ever talking about the negatives.    

In the 90s, the Asian currency crisis saw the value of people's stocsk and their money suddenly falling up to 80 to 90%.

Additionally, regulations are also set by regulatory agencies, FDIC, Comptroller of Currency and beyond that Fannie Mae, Freddie Mac, USDA, FHA, VA and SBA can and will go further by region or market area.As to seller concessions, generally if concessions do not exceed 2 to 3 % of the sale price adjustments are not made but in the narrative section the appraisal will mention that closing costs were paid by the seller (in comp 2, for example), but if it is not significant it may not be.This does not preclude the appraiser from investigating the terms of any sale.

Take the Forex Market( the foreign exchange market) where people buy and sell currencies.