I don't think we will see Wars as we have done in the past. I think the age of the kind of warfare we have seen from the second world war to Vietnam and Iraq 1 & 2 isnt the kind that would be fought in first world countries.
I think a third world war will be fought in ways never before seen. Economic warfare, technological warfare, political and social warfare with movements that can create an army from the populous within the impenetrable boarders of such superpower nations and I think we are witnessing such a war at this very moment in history.
Russia, China and Communism, America, Democrats and Socialism. Between nuclear capable superpower Nations we will never see Armies, Tanks, Planes and Ships because there is but one outcome of such warfare and it is for that reason the nuclear deterrent is names thus.