Charles Foster Kane
Rosebud
Unless the rest of the world is following your lead all you're doing is scheduling the demise for your culture as you will become a weak target for the other nation states that want your resources. If you want to do something about the carrying capacity of the planet, low birth rates really isn't the answer unless you're advocating a zero or negative population growth.
So you do concede the over population is a big problem, considering you say the countries that overpopulate will want to take the resources off the ones that actually managed theirs. This isn`t just a nation problem, It`s a world one. There will be a time when there isn`t a choice but to do something. I just hope it`s not too late.