Hopefully, we've become a lot less tolerant of that kind of tyrannical crap.
If gold is confiscated at a predatory exchange rate to Federal Reserve Notes again, the international currency and debt markets would make it impossible for DC to continue to fund state’s deficits.
In short order the Congress would become unmasked, and the wolves would be out in force.
Congress could appropriate a few Trillion dollars to unemployment insurance subsidies to the States, the States could distribute the monies, but the state employees themselves will not be able to afford a loaf of bread fro their kids to eat, and the unemployed will be starving to death in the Unemployment office lines.
Gold confiscation would cause near immediate hyperinflation... at a time when the US, EU and Japan are unable to cope.
The shackles that keep this union of states together in a Republic will rust away immediately.