Without reading all the thread, this may be already mentioned,
Some people say the Cold War was WWIII, and THIS is WWIV. I could certainly see an argument for that. America and Russia were smart enough to let third world nations fight for them, and many millions of people died as a result.
This is as world as war gets. Sorry for the disappointment. Some people would love to have a conflict so grave, that every single person in America must sacrifice if we hope to win, as happened in WWII. In these situations, it's easy to see black and white, and believe in what you are doing. But in THIS era, the problem is, technology has made the world much smaller. You notice, the only nations causing conflicts are the ones with restricted media access. Everyone else is well enough informed that their government can't lie to them well enough to convince them they should fight and die.
They other way technology has made this different, is it takes a lot less manpower and machine to accomplish a mission than it used to. I remember a comparison I saw from an Air Force general referring to destroying a ground target. Back in WWII, to drop one bomb on a specific piece of real estate, it took multiple missions, many heavy bombers, support fighters, casualties, prisoners, and shot-up bombrs limping home. Now, the vast majority of such missions are one plane, one bomb, no casualties, satellite confirmation, no follow-up necessary.
The world is smaller. While the missions aren't exactly easy, they require much less sacrifice to accomplish than they used to. The only way I see something as big as WWII happening again is to interpret Revelations literally, and I think something of that proportion is a LONG way off. Like I say, people WISH it was as passionate as WWII, but this is as big as war gets for the forseeable future.