Does not matter. ISIS has the ball and is on offense.
They can pretty much dictate the rest of Barry’s term and his ultimate legacy by continuing to release beheading videos.
IS can just make sure they blend into the local population during airstrikes.
While we can reduce their ability to export oil with airpower, they can be smart enough to have 0.0 casualties from air power. Melt away. They hold CITIES. We aren’t going to reduce cities to rubble (though we should, starting with Raqqa.)