This article doesn't seem to consider the role of natural selection on birthrate, but presumably this will act to arrest the decline eventually? Presuming indiv

This article doesn't seem to consider the role of natural selection on birthrate, but presumably this will act to arrest the decline eventually? Presuming individual desire to reproduce is variable and can be influenced by your genes, then individuals with a stronger desire to reproduce will be overrepresented in each new generation. Individuals for whom birth control is less effective, who stay fertile longer, etc. will presumably also be overrepresented. At some point I would expect this to lead to a return to growth.