That is an interesting way of looking at it. I suspect there is more to the falling birth rate than just that though. One factor is that women prefer (on average!) to date and marry higher status or wealthy men. Since the work place is increasingly pushing women into higher positions and salary with the results that there are fewer men of a higher status or wealth above them, we are getting a situation where an increasing number of women are finding that the suitable dating pool is getting much smaller. I am not making a judgement call on this, just commenting that sometimes you can't have it all!
