Well.... ISIS is collapsing political structure - including the military - like butter. Word is Iraqi government was going to vote on asking us for drone strikes, but too many had fled to convene a quorum.
Look for Baghdad to melt away, politically, too.
I read and heard where Malaki asked early on for air strikes when AlQaida was marching down a single road from Mosul.
A "multicultural" society lacks the cohesiveness to survive an attack by a large cohesive enemy.
Iraq is part Sunni, part Shiite, and part Kurd (who, while being a mix of Sunni and Shiite, have their own ethnic identity which supersedes any religious alignment with Arab Muslims). It's hard to produce a common loyalty.
ISIS is homogeneously hard-line Sunni. They are very cohesive. That's why they are currently winning. The only thing that will stop them is for Iraqi Shiites to get their shiite together.