Who creates war? Power-hungry politicians (or "leaders").
What drives power-hungry politicians? Power and money.
How does one get powerful? By making more money.
Who sponsors the power-hungry politicians? Rich businessmen.
How do rich businessmen make money? Cheap cost of production (including cheap labor) and huge markets.
Where are the cheap labor and huge markets available? Several developing countries.
What happens if there is a world war? Cheap labor and huge markets will suffer.
So, what happens? Rich businessmen become less richer and hence wont sponsor power-hungry politicians.
So, what happens? Power-hungry politicians lose power.
So? So, the basic ingredient of war (search for more power) is weakened.
And then? War will cease and economies will be spurred by the power-hungry politicians.
So, why create war in the first place? Exactly.
Hence, there will be no other world war. Money drives the world today and will do so in the future. When businessmen and politicians can make money, why make war?