The observation is being made that the war on ISIS united many factions in the middle east. This is similar to how the Cold war between the Eastern Bloc (the Soviet Union and its satellite states) and powers in the Western Bloc (the United States, its NATO allies and others) suppressed other factional conflicts on a global basis.
The ISIS effect is tougher to define because the middle east has been a series of wars and civil wars. We are now transitioning to a war over the establishment of Kurdistan between the Kurds and Iraq, Iran, Turkey and some forces in Syria.
There were millions of Cold War related casualities.

Brian Wang is a Futurist Thought Leader and a popular Science blogger with 1 million readers per month. His blog Nextbigfuture.com is ranked #1 Science News Blog. It covers many disruptive technology and trends including Space, Robotics, Artificial Intelligence, Medicine, Anti-aging Biotechnology, and Nanotechnology.
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The Saudis and the Iranians are fighting 4 proxy wars today. Ending one may mean the others heat up.
The Kurds have bled for this. They have earned a country of their own.
The enemy of my enemy is my friend.
But if my enemy goes away, are we still friends?