Wars end either when one side emerges victorious, or when protagonists simply tire of fighting. Sometimes, peace follows. And occasionally, this is followed by reconciliation.
Yet nothing of the kind is even remotely feasible in Syria, where the war has already killed half a million people and will next week mark seven years since its eruption. Not only is it set to continue, it is also most likely doomed to expand. None of the combatants is exhausted or defeated. And for each fighter who bails out, at least two more stand ready to jump into the fray.