Birth rates are slowing down almost everywhere. There are countries that know this, and want to address it. Russia, the first country that legalized abortion, is now looking at criminalizing it. Iran is considering a ban on vasectomies. Uganda just passed anti-gay laws, and China relaxed its one child policies. I doubt though, that these policy changes will be successful. China has already noticed that the birth rate is not going up, even after relaxing the one child policy.
We, on the other hand, are dominated by a political party that owes its existence to promoting anti child policies, from gay rights, to abortion, to promoting STDs which cause infertility. In order for us to change, we have to change the democrat party, and they won't. So I expect us to go over the demographic cliff.
Only one major developed country made it past the demographic cliff and that’s Israel.