This is the only sensible strategy against IS as it exists right now. Train and equip the Kurds, send in special forces and back then both up with punishing air power. The Islamic State is about to learn the same lesson that the Taliban did in 2001 - when you are a state, with a conventional army and territory to defend, then professional, well equipped western militaries will utterly destroy you. All that technology and firepower that was relegated to uselessness against an insurgency is really, really good when deployed against an enemy nation, and the West had learned is lesson (for now) about the kind of massive ground invasions that asymmetric tactics work well against. IS are going to bleed dry very quickly, I suspect. Won't do much to stabilize Iraq, but it will stop this particular splinter from doing to much damage in the long term.