Iraq: Headed Towards Civil War?

While Dubya thinks that things are going well in Iraq, the situation seems to be barrelling towards Civil War. As the new Iraqi government pledges harsher reprisals against Sunni-lead insurgents, Sunni's are becoming more and more fearful of the Shiate led government. Does allying with the insurgents follow for the peaceful majority of Sunni if they continue to feel threatened? We can hope that it can be avoided, but nobody's proposing anyway that it can...