At which point war is a ridiculous concept.

Yes, this is all about the relationship between cooperation and competition in our global system structure. Throughout the 20th century competition in the form of military aggression for land and resources seemed to have been winning out (especially in the first half of the 20th century). In the second half of the 20th century this subsided on a major scale because no major powers were directly at war - instead they fought in proxy wars with one another. Today global markets make it increasingly difficult for developed countries to go to war with one another because they all depend on each other so heavily for economic stability. This should continue and accelerate. The integration of global markets also puts a major selective pressure on our system to govern those markets on a global scale. In the end, if trends continue, we should get a planetary scale of governance during the next metasystem transition.

And that indeed would make war a ridiculous concept. However, I'm sure there will be internal disruptions of various kinds - perhaps new forms of group violence. Hopefully not, but it's possible. Terrorism - although Americans make too much of it - is projected to increase.