I think you underestimate ISIS.
These people have been fighting against us for more than a decade....against our ground troops, air power, drones and special forces. Some within ISIS were trained in our tactics by the US military itself!
The longer you fight an enemy, the harder it becomes to defeat them.
The obvious answer is to change the tactics we use against ISIS. Well, first, that would take a commitment to actually destroy ISIS (which Obama will not give).
Second, the US military does not change tactics quickly. That is why we fought VietNam as if it was World War II and lost many lives to that mistake.
I am afraid that ISIS will not be an easy defeat for us.
We fought Vietnam with incredible constraints. The NVA overran the South with a conventional armored blitz that would have looked familiar to Guderian after we decamped.
We have fought in Afghanistan and Iraq with similar constraints. We shouldn’t be surprised at the results.
We’re not serious about addressing the root cause ideology that is the problem. Until we are, we should stay out of the Middle East.