"How do you deal with the ISIS threat?"
The first goal should be to take away ISIS's ability to form a stable caliphate with the wealth and power of an oil producing nation.
US strategy, as this point, does not require an all out "win the war" against ISIS and jihadist terrorism. No nation or coalition of nations will ever end the fighting in the ME. If you accept this as fact then you can form strategies to at least minimize and contain the threat and limit US military involvement in the ME. Let the factions fight it out among themselves.
