There is no prospect of a rebellion overcoming the US military machine, and its presence would allow the GOP to be purged and suppressed. Maintaining a low level of guerilla activity would allow this to continue.

The GOP is playing a very dangerous game for themselves moving in this direction.

What do you think happens if half of the country sees that government as illegitimate, including many members of the military? Governments aren't magic. They exist only if enough people see them as legitimate. The scenario you outline, as supported by polling data, implies to me approximately a third of the country would reject this outright as a legitimate government, with a high bias towards the military.

Are you really thinking this through? Do you know how easy it would be for there to be a guerilla war in the US, which is organized in part by military defectors? All it would take would be for enough belief that the country's goverment had become tyrannical. This is exactly the premise of the two prior situations where Americans mobilized for war on our own soil. The scenario you outline is precisely the situation that most strong supporters of the second amendment believe it was created for, and why they exercise it - to provide a deterrence and eventually, if needed, a mechanism to overthrow a tyrannical government.

If someone talks up rebellion and civil war to try to prevent some legal action of a democratically elected government, I will just look in them in the eye and say "Rebel and be damned."