ISIS will meet its end as soon as they're foolish enough to challenge a nation with a gathered fighting force. Iran has been projecting it's influence in that region for a considerable amount of time. They won't want to give that up. Also, to the point that ISIS has equipment that the ISF left behind when they left, that is true. What they don't have however is operational knowledge of any of the machinery, or how to fix and maintain them to keep them in proper fighting shape. They barely worked when we were using them, I can only imagine what kind of condition they're in now.