No, it was "when we've lost, our last regions will join you and become D'Haran, Terran will be dead".
Problem: There was only one fight in this war, and Terran won it.
Hell, look at Saffalore the realm. Now those are some tough characters. They're still around, even if it's probably not real comfortable, because that was a real realm that wanted (wants, even) to exist. Alaster folded preemptively. He defeated himself with his cockamamie scheme.
