Following your argument, another solution would be simply to enact measures to revert that "certain level of intelligence and awareness", and it seems that some countries are doing just that, if not exactly for the sake of reproduction :-) . So there's hope for population growth I guess?

> Now that I think of it, maybe the problem is that human societies grew too big too fast and our brains didn't adapt. We're capable of self-sacrifice, just in a group of max 20, not 20 million. We need a completely new paradigm of organizing the society.

This however is something I agree with, fully.