Degrowth

That would be the absolute worst case scenario which I don't think would happen. Barring world nuclear holocaust they're pretty immune. Look at the Russian oligarchs, for the most part even with their assets frozen in multiple countries they're still living in opulence as they have money stored in plenty of countries that don't hate them. That's the trick, they're so rich they cna afford to have multi million dollar piggy banks all over the place.