I like saying this less then anyone cause I have a kid in the service.
Its going to take boots on the ground to do it. That fact is like the 800 lb gorilla in the room. Everyone knows it but nobody wants to say it. Our allies, so called, in the region are just not up to it and your not going to win any war with just air strikes.
Now they scheme to kill the PM of one of our closest allies? Well that triggers a legal defense treaty. I have some experience in the region, less then some here, but while avoiding the "P" word I can tell you there is a way of thinking in this troubled part of the world that "if Im everyones friend then Im nobody's enemy". Folks there just want to survive and raise their kids in peace like we do.
Without a long term combat commitment by America and her allies I dont think we can win. We can probably manage it, as we have been doing for 40+ years, but I dont think we can win. We're going to have to call it a "War" and then act like it is! one.
This isn't going to go away until we get into the proper mental state of mind. When facng a force like this you cannot dissuade tehm with rhetoric, golf scores or threats. This force will not be stopped short of their inability to consume oxygen. Until and unless the decision is made to engage them at that level they will continue to be a blight on whatever portion of the world they infest. You do not reason with a deadly bug / snake, you kill it and keep it from reproducing.