i dont think we'll see any more 'major' wars.
I think they have a few small ones to milk countries with oil or other resources who won't play ball.
But one of the postiive side effects of globalization is that it's bad for business for a USA/England to trade missiles with Russia/china.
We know the millionaire in USA has FAR more in common with the millionaire in China than he does with his fellow americans. The rich would ALL lose their shirts if superpowers started firing on each other.
So IMHO, it'll keep being a series of elective proxy wars. Which is actually a GOOD thing... if you don't enlist or have the luck of being born in an ignorant place sitting upon a ton of oil, you're probably in good shape.