If the problem of too many people for the economy's ability to support the population to a 1990's living standard was limited to Syria, I doubt anyone would care...except Assad, and the Syrians, of course. The same problem resides in every country in the region, and is creeping like a plague into Europe and Asia. But if it is not war now, it will be famine triggered riots later that lead to revolution, and there are many countries far too shrewd to let that happen to them. China, Russia, Europe, all have the same problems approaching them, all due to bad economic management produced by corrupt government.

War, in the long run, is an inexpensive export, and an effective population control as well. The US has been exporting it for 7 decades at the least. I doubt we will stop anytime soon.