In many locations where there are conflicts a reasonable change in governance would do much to alleviate the hostility. In the deeply divided country of Iraq political changes are a must for any chance of progress. Hopefully I'm wrong, but I see little reason to believe there can be a one Iraq solution, and instead we'll see a formal or informal division of Iraq into at least three ethnic enclaves. Even if that happens it won't appease IS I who desire to impose a caliphate throughout the entire region based on their interpretation of Islam. That problem is very much a military problem unless the majority will peacefully accept their rule, which isn't possible. At this point in our discussion I think there are political aspects for the Iraq problems that need to be addressed, and if they're not any military action will only achieve short term effects, but at the end of the day military action will be needed against the IS I.