I'm not sure how specialized humans are. Many of us are incapable of living outside of a technological society. But there are people scattered throughout the planet who live well with primitive technology. Tragically, those people have been and continue to be pushed to the limits of extinction.

The brains we evolved allow us to adapt to our environment. Even if civilization collapsed, humans would likely survive.
This is not to say that we will survive. If evolution teaches us anything it's that there's no guarrantee of survival for any species.