Worse case scenario -
the non-American Black Muslims decide that Obama is an apostate and must kill him immediately if he does not return to being a Muslim sooner than that.
Obama doesn't return to being a Muslim so now all the Muslims are committed to killing him. But, because he is PotUS, he is well protected, sort of.
Of course, now all the Black Muslim people in America are at odds with being Black Muslims because Obama is a Black President and they don't want to kill him because the rest of the Black Americans will be against them for killing their Black PotUS.
Then along comes some NORTHERN AGGRESSIONIST person in blackface pretending to be a Black Muslim and kills the Black PotUS. But, half the Black Americans aren't buying the blackface and go on a rampage against all the white people for killing their Black PotUS. The other half of the Black Americans believe it was a Black Muslim who killed Obama and they go on a rampage killing all Muslims in America - black or not - for killing their Black PotUS.
When it is all done, the only one standing even remotely associated with political leadership is Palin because she is hiding out in Alaska with Joe Sixpack and the Plumber wrapped in polar bear fur lined with seal skin. Black People are not going to Alaska for no damned reason, not even to avenge their Black PotUS.
All white persons that have somehow managed to survive the holocaust migrate to Alaska where they live under Palin's protection, subsisting on whale blubber and yellow snow.
The Mexicans continue to cross the border, now in unbelievable numbers, and take over the bottom half of what used to be the United States.
With what is left of the US living in Alaska, Russia bombs the hell out of Alaska finishing off the remnants of this nation.
The Mexicans send the Muslims head cheese and they live happily ever after.