I don't know about the part when you say that ISIS will call all Muslims to holy war if the U.S . come to act as a peacemaker. I rather think that they work separately from Islam and that they are just an instrument of some other force that we have been mentioning. It is not so hard to convince those who believe.
Saudi Arabia decision is surely made by some kind of logic and if they wait for Americans to step up I am not sure they will be getting there at all. Divide and conquer is something the U.S. knows very well and of course that Obama will make decision not to meddle in the middle east crisis. I have read this in some article here on the forum.