I think the threat went beyond domestic terrorism; it was bordering on armed revolt and revolution.
We don't need that now (and it would be hopeless vs. modern police/military unless you had an issue, like 2A, supported by most of the individuals in police/military, combined with a constitutional justification like an unambiguously unconstitutional move by one branch of government vs. the others, like a hypothetical future President closing the Supreme Court), but a similarly forceful threat, like removing $100b/yr of business from the US or a mass expatriation, could probably work.
We don't need that now (and it would be hopeless vs. modern police/military unless you had an issue, like 2A, supported by most of the individuals in police/military, combined with a constitutional justification like an unambiguously unconstitutional move by one branch of government vs. the others, like a hypothetical future President closing the Supreme Court), but a similarly forceful threat, like removing $100b/yr of business from the US or a mass expatriation, could probably work.