"In the worst case, this decision could become the catalyst for a new round of large-scale domestic terrorism from the right. As I've noted, everything I'm seeing points to a subculture that is gearing up for this kind of heroic last stand in defense of a lost cause. And this time, it's not going to be just a few white supremacist/militia/patriot/anti-choice wackos. The new crop of right wing militants is better connected, better trained, better armed, and absolutely determined to go down fighting. And, as the SPLC keeps telling us, there may considerably more people motivated to support them than there have been in the past. It’s not unthinkable that between 15 and 20% of the country could be inclined to start -- or at least support -- a civil war over this."
* The most likely case (if all current trends continue -- which actually only occurs less than half the time)* The best case (if everything goes right)* A couple of high-impact, low-probability cases (black swans, wild cards -- rare, but totally disruptive if they do happen)* The worst case (what will happen if the most negative factors present in the scenario all come into play)