At some stage, you’re going to have to face the Islamic State as a country, and even consider a truce. If there’s no military only solution to the Islamic State, and that’s already on the record as being the case, then after you’ve tried getting the other Sahwah tribes to turn against it and finished mucking around trying to find ways to cut their funding or shut down their media message (which has already cost the US well in excess of $1.3 billion and completely failed) at some point the only option left will be an offer of a truce.
...War is entirely predictable in that it can only lead to one of two outcomes. Either one side emerges victorious while the other is vanquished, or some kind of truce is reached. It is the only way wars end, and America and its allies will never win this war. They know it and everyone else knows it as well. At some stage the only option that can prevail for America and the West is the sensible one.
The editor adds a note to Cantlie's article, pointing out that any truce would be temporary.