This really seems like one obvious way in which we are effecting our own evolution and would not be surprised if in a short time (on an evolutionary scale) that humans will require c-sections for successful birth.
This may not be a bad thing, the reason child birth is so difficult for humans vs most other animals is our head size vs the female pelvis. C-sections bypass the evolutionary constraint allowing more large headed babies to smaller pelvis women which could allow greater head size and perhaps even more intelligence.