Then it would occur in circumstances radically different from the circumstances that attended the Civil War.
It wont be another revolution because there will be significant numbers of people who would live with the new rule.
In other words, it would reflect the will of the people and proceed according to the consent of the governed.
I’m asking you a moral question, void of the context of the Civil War.
If the the US government abolished the Constitution (even if corrupt courts ruled that as “legal”) and adopts another form of rule which causes an even split in society bewteen those who want to retain/rule under the current constitution and those who choose a tyrannical but seemingly more secure form of government, would you consider insurrection to preserve the old Constitution?
Don’t dance around, answer the question as it’s written.