The collapse of the Iraqi Army as ISIS attacked, was largely the Sunnis and Kurds defecting en masse to their respective sectarian communities/militias, and the Shia then panicking (most of the technical specialists were Sunni). Everyone had lost faith in Prime Minister Maliki as nothing but a sectarian Shite.
That has stabilized now as a primarily Shia force, augmented by Shia Militias commanded by Iranian officers. They may be defeated, but they are unlikely to just dissolve like before.
Interesting analysis, thanks.
The dynamics there are not easy to understand.
This will likely turn into a larger sectarian war. The Sunni areas will likely not be thrilled with Iranian intervention.