Maybe the populations of Iraq and Syria will be decimated if the war continues but other places, not much of an impact at all...
“Maybe the populations of Iraq and Syria will be decimated if the war continues”
And maybe muzzies from nests all over the world will go back there to fight for whichever side - who cares - and further reduce their numbers. This could actually help save modern civilization which is too wimpy and stupid to realize self-preservation is a GOOD thing.
“...they could be looking at low birth rates.”
The Arab world is heading toward a demographic cliff. Birth rates have roughly dropped in half over the last 50 years. Women are marrying in the late 20’s on average, instead of the late teens. The traditional family size has dropped from 7-8 kids, down into the 2-4 range. Those trends are continuing downward, rather than leveling off, as society modernizes.
Although there is a relatively large percentage of young folks (especially in Egypt in Yemen), there is a big bubble coming down the pipeline.
Except for a few Asian Muslim Countries like Indonesia and Malaysia, Muslim reproduction in general now lags the human average. In some areas, especially the wealthier and more urban, the bubble of lower numbers of young graduates entering the workforce (or military age, if that is what we are looking at) is already starting to hit.
China, with its one child policy, is just now starting to head over their demograghic cliff. It will be a drag on their economy and society for decades.
What is pretty different about the Middle East though, is immigration - many (most) educated people would like to leave, and the “Arab Spring” has set off the largest refugee movement since WWII.
The actual killing of the men has for the most part, not risen to the scale of making a dramatic impact, as WWII did in Russia (except for targeted minorities like Christians and Yazidis). Women are the more significant factor. The killing will be a drag on the population, but many more people are fleeing than are being killed. The demographic outlook for Arabs is not good.
If oil and gas prices stabilize in the “Shale band” of $45-$65 per barrel, the Arab world could be facing a Lost Generation of economic doldrums - especially if they first reduce their cities and infrastructure to rubble in war.