Not WWIII. We aint that stupid, neither are they in the middle east.
The problem with the middle east is that America armed most of those country's. Irak, Iran, Isreal, Egypt(english Spitfires). As some of you might know that Isreal has been the cause of many wars in the middle east, wich was actualy a big screw up from britain with the Balfour declaration.
But, all of its surrounding country's have a hughe grudge against it, and this, is causing quite a lot of problems for America to act in the middle east as a negotiator. So, threathing with a invasion there wont impress those country's. Because they see the western world as a Ally of Isreal.
WWIII is very unlikely, just imagine the hugh crisis that would errup in the middle east of they werent able to sell there oil to America, Europe, or Asia.