Very interesting proposal. I actually remember hearing some professor (of some sort of biological/sociological background) describe birth control as arguably creating a new species as far as females go because never before did they have any sort of reliable control over their reproduction. He actually believed that it was such an incredible event in human history that we have yet to fully understand its total impact on society and that we should consider modern women as fundamentally different now - to such a large degree that he considers them a new species of human females.

Definitely not simple. But the pill is probably the most important invention of the past century or two. Maybe the transistor comes close.