Suppose India, China, Russia, and Europe took over policing the Middle East, so we could shift our attention elsewhere. They wouldn't do it, you say. Who knows, maybe they would.
William W. Chip, writing for the American Conservative, believes that because these four large entities are in the Middle East's neighborhood so to speak, they just might police it. Clearly, the U.S. is not located in that neighborhood.
It's a good article, although somewhat isolationist in tone. One factor Chip doesn't deal with is our desire to protect Israel from its neighbors.