If it does go to that extreme, it would be global. Sure, it may start small, or comparitively, with Arab nations once again going against Israel, but it could very quickly escalate pulling Europe, kicking and screaming, into the morass. Reason? High Muslim populations, high Jewish populations. And if the fans are flamed, as I've no doubt they would be, America would be dragged in as well thanks to networks like Al-Jezeera and radical ultra-conservative imans. And like it or not, most of the world's oil comes from the Middle East, not just for the US or China, but for Europe as well. Judging from history, the US will get blamed, just like they did with Somalia, though that was a UN peacekeeping effort, and Saddam's atrocities after the Gulf War of 91.