Is this a joke? Current Iraq, sans IS territory is basically a de facto vassal state of Iran. It's very difficult to imagine a change where Iraq would be any more pro-Iranian than it is today in such a short period of time. Vice news had a really good video on their reporter who went embedded with Iraqi Shiite militias. Unlike government which has to at least maintain plausible deniability, militiamen themselves are fairly open about who their support and materiel comes from and who they see as their own.
While it's true that current Middle East situation is not "as bad as it could get", that's only because "as bad as it could get" is a nuclear exchange between Israel and Iran or one sided nuclear strikes into Iran by Israel. And the current situation is not that far away from it now that Iran became a true regional hegemon after Iraq became it's vassal state and feels quite empowered by it. If anything, IS actually serves as a dam containing Iran's influence's westward expansion in the region.