By the time it is "over" (whatever the heck that means), the U.S. will only be able to maintain order by using ruthless means (through Arab surrogates, of course).
It's important to remember that the defining photo from the Vietnam War doesn't have any Americans in it . . . it's the photo of the South Vietnamese cop shooting a suspected Viet Cong guerrilla in the head. These things have a way of sorting themselves out regardless of our best intentions.
Have a great day!