In the less developed world we would see a dramatic population crash, as these nations have so many children to guarantee some hope of security for the parents in old age. If the parents thought 2-3 kids meant 2-3 adult children to care for them, that would be sufficient. I'm afraid to even BEGIN to imagine how the Islamic world handles this.
The European Union is doomed, as any hope of prosperity is dependent on a certain ratio of retired to those entering the workplace. Now the ratio can't be maintained barring a gigantic expansion in non-European immigration.
Did I say Muslims? Perhaps I meant ALL religious nutjobs globally that like to be fruitful and multiply.
Israel is probably very happy about this, and any group having difficulty with a neighbor or internal faction enjoying a higher birthrate.
In the US, the white majority is not only locked in but will actually rise in the near future as a percentage of the population, unless the US ups immigration dramatically which it might well do.
In those parts of the world where population growth is inherently stable we can assume a slower decline in population, assuming places like Italy and Scandinavia can RAISE their birthrate to the full amount still possible.
2 kids is NOT replacement level since some will not live to grow up, or will not marry, or will not have luck with having kids of their own. No adoptions in THIS world! I believe the number needed is 2.3 children per family.
Hmm, it does get interesting. Can any Catholic marriage where the woman had two abortions be automatically annuled on the grounds of the woman being sterile?
Is there some high-tech way of getting around this? There was, in theory, in DRAKON.