Conscription is a harder capability to maintain with a mobile populace, but is increasingly irrelevant in a world of automated warfare waged by small and highly professionalized military and police forces. Even if (say) half the population of America happens to be traveling in other parts of the world at any given time, that should not significantly affect the ability of the American government to wage war on some unfortunate little country.

The already-massive mobilization of the late 20th century has made it very difficult for any large powers to wage war on each other without sacrificing a large part of their population as unwitting hostages. The next step of this process he's outlining seems to be an intermeshing of ethnicities to the (eventual) extent of the Global Brain theadvancedapes talks about. At which point war is a ridiculous concept.

If this seems like a very banal conclusion to draw from a very impassioned debate, that’s a good thing. The evil and good that states do is a matter of a balance of banalities.