I would not predict disaster. After all, the people most upset would be the same ones that said they would leave the country forever if GWB won a second; and I believe most of those pos are still here. They seem prone to big talk and very little action (especially if it comes with a personal price). There would be a lot of yelling, maybe a few riots in the ghettos, but would calm down soon IMHO. The BIG issue would be Biden in the Oval Office....that may take decades to recover from!
Then BHO would be a constant fixture, forever harped up by the MSM.