Video and source: https://xcancel.com/dieworkwear/status/1951851958559703117#m
Depends on what you mean by a complete crash. Equites crash, property values cave, massive unemployment, these are good for the oligarchs.
Now if the paper markets freeze or securities jump to double digits, they are looking at the USD losing (some of at least) its status as the reserve currency. That would hurt their fortunes on paper, but they would outright own enough physical wealth it wouldn't matter that much. And as you pointed out, they can just move somewhere else or live in fortified palaces and travel in armored cars or aircraft? This is getting a bit Gibson-eqsue now, a bit hyperbolic on my part perhaps.
I suppose that's what the crypto is for.