Firstly we are not at war and never went to war in Iraq, technically it was an invasion. Why would we nuke Iraq? What kind of freakin math is that? Why would it end by starting a new world war. What are you basing these predicitions on?
Again, what are you basing that assumption on? He was the one that said that Iraq/Afghani conflict would be over in a matter of weeks. He is also the one that said we will stay there for a million years if we have to. That sound like an exit strategy to you?