Not really. To assume it’s ludicrous, one would have to further assume the Armed Forces would shoot down civilians. A corrupt government is resented but tolerated in the U.S., so I doubt that would be the cause of an armed rebellion. More likely a more tyrannical government that we presently have would be the cause.
And if the government was intolerably tyrannical, those in the Armed Forces would know it too. History tells us of a number of occasions in which armed forces wouldn’t open fire on civilians, even sometimes the forces of very tyrannical governments.
So, improbable, yes, ludicrous, no.