The US court ruling forcing Argentina to pay its hold-out creditors has big implications. This column argues that some of them are particularly worrying. The court ruling undermines the possibility of negotiated re-structuring of unsustainable debt burdens in future crises. In the future, it will not be not enough for the debtor and 92% of creditors to reach an agreement, if holdouts and a New York judge can block it. This will make both debtors and creditors worse-off.