That is likely to happen, sooner or later, no matter what the US does or doesn't do. Lives would/will be lost but that would/will also cause them to visit Allah quicker.From what I can tell it seems as though ISIS tends to do the unexpected, e.g., opening new fronts to spread their opponents thin. That's what they did in opening up a new front in Lebanon. If Obama gives them more grief they will probably make an appearance here in a mall near you.