You know word "liberal" has quite different meaning from 100 years ago 
by our current standarts the liberals of old would be conservatives today, while liberals of today would be called bolsheviks by liberals of old. So, you are completely correct, drive for innovation and change will not die out as it is inherent part of human nature.
Secular cultists, who see themselves above laws of nature will die out, however. Narcissism cannot defeat God and social engineering cannot defeat Nature.
What we call "liberalism" in 21st century is not future, it is graveyard headstone to evolutionary dead end. Fertility rates are just reflection of that.
by our current standarts the liberals of old would be conservatives today, while liberals of today would be called bolsheviks by liberals of old. So, you are completely correct, drive for innovation and change will not die out as it is inherent part of human nature.Secular cultists, who see themselves above laws of nature will die out, however. Narcissism cannot defeat God and social engineering cannot defeat Nature.
What we call "liberalism" in 21st century is not future, it is graveyard headstone to evolutionary dead end. Fertility rates are just reflection of that.
In Western nations such as Italy and the United Kingdom, more than one-third of the women are likely to remain childless till the end of their life. This is what liberalism and radical feminism can do to you.
Declining birthrates is related with less dependency on your children. Your income is not dependent on your children anymore to a large extent, in comparison to third world countries where parents are dependent on the income and care of their children. Also child mortality has decreased, which makes it less necessary to have more children to ensure your offspring. This is what increased welfare does to a country, as it is the case in western societies but also Asian economies such as South Korea/Japan. By your logic people in Saudi-Arabia should have way more children then in Ghana. Life expectancy,wellfare and child mortality are however key denominators.