>I just edited my comment to double down due to downvotes, but this ruling will ultimately damage the US more than Argentina. If we establish that it will be impossible to restructure debt if you issue your bonds in the US, we've established that there's no reason to issue your bonds in the US.
Every country in the world knows that it is going to be easier to restructure if you issue bonds under local law. No one selects New York law for its bonds out of some naive inertia. Argentina specifically went out of its way to select New York law and deliberately put in a pari passu clause because it had a history of defaulting on debt, and it thought it wouldn't be able to raise money, or at least not at the same rate, if it issued bonds under local law.
I can't think of any possible reason to relieve a country of obligations that were deliberately and knowingly undertaken to tie its own hands in order to make its debt more credible.
If you want collective action on restructured debt put in a collective action clause. If you want a sweetheart interpretation of your debt clauses issue it under local law. Every country that is issuing debt knows these things, they aren't rocket science. The reason they sometimes choose not to is because they want to pay a lower coupon and/or be sure that the whole issue will be purchased.