Interesting article but I'd be more cautious about projecting current trends into the future.

If history teaches us lessons, one of them is surely that the masses sometimes prefer war. Americans may be doves or isolationists today (with Iraq and Afghanistan recent in memory) but if US adversaries push too hard, if there's some large scale terrorist attack (or even just a viral incident), the US public will become hawks overnight.

It's exactly at moments when we start asking questions like "are states becoming obsolete?" that we should start to worry.