But Iran? If Iran were to obtain a nuke, either by building their own or just buying one from North Korea or Pakistan, that might very well be the flashpoint. This is a line that has not been crossed since 1945, and was Iran to torch off a nuke in Haifa - or New York - that would almost certainly plunge the world into conflict.

Watch Iran. Watch the least stable players. Hopefully, reason will prevail, but as von Clausewitz famously said, "Only the dead have seen the end of war."