Well yeah, "violent upheaval" is what happens when you eat Chick-fil-A.
But seriously, I don't see it. Who are the opposing factions going to be? Are the Libertarians going to finally use their guns to overthrow tyranny like they are always droning about? Are the Teabaggers going to mount turrets on their Hoverounds? Will Occupy Wall Street actually occupy Wall Street?
Not going to happen, no armed insurrection is going to last very long in the face of the US military. No matter how many guns you've horded you aren't a threat to an Apache gunship and no amount of tin foil will protect you from a Reaper drone. The only even remotely plausible scenario for an actual civil war would involve a second secession, which will never happen because it is essentially demographically impossible to unify a state politically. Even solid red states tend to have Democratic strongholds in their urban centers. This idea of a second civil war is for the foreseeable future a paper fantasy.