Well, my friend we just reached the point that Einstein mentioned in his famous quote:
"I don't know what WWIII will be fought with but the fourth will be fought with sticks and stones"
In a universe that we just imagined, the war, should it go nuclear, will result in Nuclear Holocaust and there will be more casualties from the post-Nuke Det radiation then from the explosions themselves, crops will fail, radiation poisoning will spread, economies will collapse, international market will be in ruin, the fuel supply will be reduced to a trickle (We just nuked the Iranians/Saudis), society as we know it will collapse and there will be anarchy. Like I said, we would be thrown back into the middle ages.