"A terrorist preoccupied with his own survival has less bandwidth to threaten yours.
It is true that there exists no strategy for victory, and no definition of victory.
This struggle is now owned by the United States."
Apart from bringing on few significant Arab Allies, what struck to me is timing - President Obama did not hesitate for this bombing when he is taking a center stage at UN. In a way, he has not hesitated to assert American Leadership role in today's chaotic world. Good or bad, successful or not; seems like some American role in world affairs is better than complete withdrawal; least because no other nations want to have anything to do with this mess. (America contributed to the mess, but there is more to that than simply blaming America here.)
Having thrown cobwebs of 'rudderless leadership', question is how skillfully and in sophisticated manner this administration brings some real progress. In my view, progress will be determined to what an extend 'skin in the game' is increased for Turkey and to what an extent America stands behind Kurds while continuing to strengthen Federal Government of Iraq.
Setting expectations for a long haul is critical. Administration has started on that, but they will still have to continue this policy of 'having feet on ground'. Prof. Drezner rightly characterizes that the'initial air attack' is generally the high water mark of America's power projection and there after it is all downhill. He also thinks that chances are more that things on ground will not change in next 3 to 4 months.
Again 'price of not doing anything is high' and having started to do something does not mean America would be firmly on the path for victory. The least what President Obama can do is to continue to be honest with Americans about all this (apart from keep whacking any other bad guys intending to harm America). There is a chance that Americans would understand all that.