Iran is a developing country, and feeling its oats. A little careful diplomacy and the right kind of aid might do much to increase secularization, which many Iranians want, and at the same time decrease emphasis on militarization.

Shias in Iran are in the majority. Thousands cross over into Iraq to worship at the shrines of their religion. The part of Iraq that is Shia would be more stable under Iranian control.
Syria is mostly Sunni, the Iraqi Sunni area belong with them.

The Kurds could form a legimitate nation, if the Turks (and Russians) would cooperate to mutual advantage and not threaten war.

Oh, well- too much to hope for.