Where to start? Game of Thrones is shaping up to be a great show, Age of Ultron is awesome, Tomorrowland sucks, Mad Max is a great return to the franchise, and, oh yeah, ISIS is running nuts!
Long story short; So long as the Iraqi army are the only ones with boots actually on the ground, I don't see ISIS being taken out. Air power can only do so much, conventionally anyway.... I really don't think people are quite to the point of wanting to see a light brighter than the sun pop into existance. Same goes for seeing a certain mixture of chemicals rain from the skies. Ditto for our ancient buddy Pestilence, although that little Djinni isn't something you want out of his Trifoil and triple circle labelled bottle. Ever.
I do suppose you could go the Cookie Cutter route, drop a GBU-43, but unfortunatly, ISIS does have MANPAD's they looted. So that's out.
The real thing I am wondering is why Iran hasn't tried to take over Iraq with their own army; I know they are heavily involved with supporting anti-ISIS militia's and stuff, but we saw what happened with the Muj in Afghanistan when the Soviets invaded; they did their job, then turned and became a problem. Potentially same problem. But Iraq is so weak right now.... or rather, their leadership is. I mean, usually when one army has more troops and arms they win. Usually. But of course, Leadership is the trump card. More than a few great leaders have won with lesser amounts of troops and arms. Or, when one side has troops that cut and run at the first sign of problems, that can account for it.
Long and short of it is, the West will likely have to step in to handle matters. Again. Unless Iran steps in.