Not much they could do if people just wind down their revenue-generating activities and just "drop out". It would be like a slow-motion general strike.
That's true. A technique I've employed myself at times. Which doesn't mean you need to do without, you just stay out of the visible economy when possible. Our reconquista amigos are very accomplished at this, BTW.
Now THAT would work, if everyone productive could stand to take a sabbatical.