The Syrian Army can still control parts of Hasakeh, Raqqa, and Deir Azzor using the direct road between Damascus and Deir Azzor. The Syrian regime is fighting intensely to control Deir Azzor and will fight hard for Raqqa. The fight for Jezzera is for agriculture and oil revenues. Deir Azzor is closer to Iraq (60 percent Shiite) and the Kurds and farther away from Turkey and thus I think the Syrian Army have a fair chance of holding up there. The nearby Sunni of Iraq are pre-occupied by their own enemies to the east, north, and south and thus have not been able to assist the FSA