There will never be a next world war, rather the fear of it will continuously be reinforced to further the procrss of turning the world's public into sheep. Once the sheep have been moulded enough, the world will unify government, all soverignty obliterated, and the masses will be helpless to a world dictatorship.
Done.
Edit: smart people run countries, even poor countries living in the stoneage. These people realize that war leads to (relatively) small profit and tons of destruction. They also realize that by fulfilling the above agenda, they can destory nothing while attaining maximum power, money and control.