Iran to handle the Shiites and Syria to control the Sunnis?   Only problem is neither group wants to be "handled" or "controlled". Nor should they. People don't seem to realize that co-religionists don't necessarily want to be "handled" or "controlled" by another state.

Negotiations involving these 2 states, fine. But don't forget to include the actual Shiites and Sunnis in Iraq. There's already been enough dictating by outside parties.