We do need to get involved, but a no-fly zone would just be making a bad situation worse. The best time to have come up with and implemented a strategy involving major US forces would have been circa 2010, by this point all big footprint options short of imposing martial law using the US military will fail.
The smaller footprint options are all fraught with risks, as are the ignore the whole area options (seems to be Obama's actual plan, unfortunately he talks intervention). I would suggest supporting the Druze near the Isreali border with the cooperation and assistance of the Isrealis, and giving the Kurds much more military assistance. These suggestions do require accepting that neither Iraq nor Syria will ever be put back together in our lifetimes. Supporting the Kurds will be problematic as my understanding of the politics of an independent Kurdistan will cause it to have border disputes with all of its neighbors.
Excellent post
BTTT
That's Reagan doctrine, which he quickly abandoned after the Barracks explosion in Lebanon.
There's 60 years of international prestige at stake. Obama would love to play Mumblety-peg with Putin and lose.