People kept saying 200-300 million on this forum, and I'm a little skeptical. Modern day Earth has 6 billion+ people. But then again, the humans were attacked by a massive alien army. So how many were really left? and where did you get your information?
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I cannot see Human civilization surviving with only 200 million. Regardless of whether we have Forerunner technology sitting around and the mantle on our shoulders, Humanity would collapse. If Earths population was reduced from billions to 200 million, then it is very likely that all major cities and infrastructure have been destroyed. With only 200 million people, the economy is going to take a lifetime to recover. Innovation and production will freeze as there will be hardly any workforce and profession. I cannot help but think that realistically the only place Humanity would be heading would be the stone ages.