Under the assumption that the earth's biosphere is a self-regulating system, population decline can't be considered a bad thing. Human economy certainly is not the measure of it's survival. There is a limit to senseless growth and finding a balance will be enforced by our environment's self-regulation.
If finding balance will be enforced by the environment's self regulation, why do we need to do anything about it? If the earth's biosphere is a self regulating system, population decline due to anything other than resource scarcity is a bad thing.
The problem is that it's declining in all the countries that have nice things like women's rights and freedom of religion while it isn't in countries where rape and violence is commonplace.
The world is going to be a much less pleasant place in the future if this problem isn't solved.
