It's *mostly* good news, but buried in that average goodness is a lot of diversity. Some populations or population groups will shrink and others will rise (in number, and perhaps also in dominance). This is more true in relative terms than absolute terms, but both will occur.

There are concerns expressed frequently, and bluntly, by some groups about how this religion or that religion is "outbreeding" everyone else. This is also said about races or social subgroups in a population.

The answer appears to be to encourage these groups to become more welthy, more prosperous, more educated. In time, they will change within themselbes, in a way that cannot be imposed from outside the country/religion/social group.