The fantastic elements of the scenario are what make it moot. The US military is 1% of America. If the other 99% turn on it then they don't even have to fight, the permanent severance of all domestic supply lines destroys the military in short order.
A society's power is higher than any institution of that society, inherently. The only limitation is will. In a realistic scenario, if 10% of a nation takes to the streets without weapons all the big baddass "God Has Sent Me Upon You For Your Crimes"-types clean out their bank accounts and go hide in the Seychelles for the rest of their lives. Armament only decreases the necessary number.
As much as I'm a fan of the intention that the Second Amendment represents, it is only a minor benefit compared to the reality of military defection that occurs in any state that's about to be upturned. The general argument that "hur you think you can fight a Predator drone Bubba" falls flat when actual historical revolutions are observed. Weapons of all grades get parceled out once the conditions for revolution exist.
Of course, that probably means some religious nutjob gets their hands on a nuke and makes everything pointless by deciding to overturn the bowl of God's wrath personally, but you know. Armchair General.