(1) I say we treat our debt "problem" like we treat our unemployment problem and treat our unemployment problem how we treat our debt "problem."
(2) I know all the cool kids are trying to denigrate a perfectly lawful solution to a manufactured crisis as "fantasy" and the product of "academic douchebags" but that isn't a good argument against it. The law says what the law says. There is no coherent reading of the law that makes the platinum coin solution unlawful. And spare me the nonsense about "stability as a union" and "political instability." You know what would really create political instability? If we breached the debt ceiling. Any perfectly lawful measure to avoid that should be utilized. It's a shame the President disagrees.
(3) Congress most certainly granted the Secretary of the Treasury the power to mint a trillion dollar platinum coin. Whether it meant to do so is a separate question, but it gave him the power to do it.
As the article I linked noted the Fed has some say too and may not go along with such a scheme.
It is the sort of academic fantasy idea where you ignore the fact that there are multiple actors involved and pretend you have absolute power. The President cannot act like a tyrant and expect our ability to borrow money to go unharmed.
Yes, of course, a failure to pay our debts will have an impact too.