It's in fact much less than that. In many first world countries the birthrate in now at 1.3 or less. That mean every person is producing 2/3 offspring. That means we will be losing 1/3 of our population every 30 years. It means economic collapse, invasion, social disassembly. Immigration will not pick up the slack, there will be nothing worthwhile to attract them to deserted cities (Detroit is already there), and rampant poverty and disease.
The last time this happened, except for transient wars, plagues, famines was at the end of Roman Empire, about 400 A.D. which brought on a Dark Age of economic, technological and social recession that lasted for centuries, until it finally emerged about the year 1000.
Essentially Abortion is the crux of a civilization that has lost all sense of reverence for life, of which its future is composed. It is racked with confusion and pessimism and is in spasms of complete disorganization. That is the fate of a society that murders its young, for the idol of 'freedom'.
John Holdren, with his regime of forced sterilization and abortion, represents an encroaching tyranny that has been embraced by the Obama administration, one that goes to the core of its ethos and supercedes all of his apparent moderation and 'dialogue'. It is radical and authoritarian. It essentially has given up on the human race, or atleast Western Christian Civilization, and now wants only to manage the first world's disintegration in a way that maintains its economic control of the Globe. That is impossible.