The next "revolution" in this country will start as a form of intifada, probably centered in Dearbornistan, but with pockets of Jihadis rising up all over this nation, declaring Sharia and demanding submission from the infidels. Look for 1968 type burning cities. In some areas Nation of Islam American blacks will join in, but that will be extremely limited, IMO. The rioting will spread to disaffected types from all of the balkanized groups, probably starting with La Raza types in the southwest and the anarchists will throw their Molotov cocktails into the ring to round things out.
And this time, unlike 1968, the police won't be able or willing to end the rioting. In many large cities they'll simply refuse to leave their precincts unless they have shoot to kill authority and they won't get that. The President will call out the National Guard, but that effort will be hampered because so many of those units are engaged in Iraq and Afghanistan. Governors in states not badly hit will try to refuse to surrender their National Guard units to go bring order to cities hard hit in other states.
At this point the average citizens, particularly those with military experience, will realize that it's up to them. You'll see impromptu groups spring up in the hard hit cities and start counter strikes against the rioters. In short order our cities will look a lot like Ramadi or Baghdad. But one thing you can be sure of, if all of this happens, there will be a sufficient number of pissed off folks in Northern California who will go looking for the judges on the 9th circus and they'll quickly be set up as human shields against the advancing hordes.
Tin foil hat removed, for now. Feel free to either snigger or shudder, as you think best.