Crypto is not going anywhere. Anyone who thinks shutting down the internet or crashing the economy is enough to stop crypto hasn't done their research.

Sure, it won't work if the power grid is down, but that's only a localized issue. There's no way to shut down the whole network without killing the internet worldwide and that would be a black hat move that could only last for so long. As long as someone somewhere in the world has a node running, everything works again as soon as power and connectivity are restored.