I keep thinking about the Iran Iraq war and Iran did not back down. They have the bodies and the mentality and it went on forever.
Me too.
The unintended isolation of Iran, the rise of the Sunni coalition against Iranian (Shia) interests, and the fact that Iraq is largely Shia may unite Iran and Iraq in a way no one will like.
Remember, Saddam was Sunni, a decided minority in Iraq, and Shia Iran wanted to depose him. Now we have a very different situation.
If there is a regional war, it could possibly line up as the Sunni Arab coalition (plus Israel?) against Iran and Iraq.
Also not impossible for Iraq to align with the Arabs, instead of the Persians. Close call this one.