As long as the theocracy of Iran and the Kingdom of Saudi Arabia continue to compete for hegemony in the Middle East and each support the rival Sunni and Shi'a sects of Islam to that end, the "antagonists to recognize the interest that they hold in common" does not exist.  Turkey, Iran, Syria and the Kurds in each of those countries aren't going to recognize any such interest, either.  Iran's continued call for Israel's destruction ("Death to Israel" on their rocket launched this month, comes to mind)  is also not part of Bacevich's 'common interest' proposal.

Warm fuzzy liberal hopes are all we have here.