"WE should stay the course, but in the worst case scenarios it will be a Sunni minority that is harmed-- not all 27 million people of Iraq. "
Surely the worst case Scenario is a clear Shi-ite dominated Iraq emerging that becomes best buddies with Iran?
My spin on the whole thing is that the reasons for war where sound, the execution of the main war were sound, the one big mistake was disbanding the army and sending the signal that we were at war with Sunni's rather than real Ba'athists. (Just because a guy was in the Baath party doesn't mean he was a baathist - you kind of had to join the party to have any kind of job). Had we kept those instutions we disbanded but purged only the real hard core saddam cronies, I don't think we would be facing a Shi'ite dominated Iraq in the medium term.
But that's all hindsight now. We are where we are, and we have to stay the duration because the alternative is terrifying.
Persians and Arabs loathe each other too much for that to continue long term.