Oh I wish ISIS would attack Saudi Arabia and leave the Syrians and Iraqis alone.
Your wish is coming, somewhat. Iran will move in. Faced with two unacceptable choices to their north, Saudi Arabia will either pay someone to come bail them out or finally use that army they have been building. The Kurds will try to hold onto their area, but the Turks and Iran cannot allow that. It is the perfect storm of hate.