One thing you have to recognize is that this advancement did not happen in isolation, and that there are many other things going on that will solve a lot of problems such as overpopulation. One example is educating women in poorer countries which has been shown to dramatically reduce the number of children they have. Birth control acess is another. 
I really recommend that you read the book "Abundance, The Future is Better Than You Think" by Peter Diamandis to get the bigger picture. Lots of amazingly good things coming. Fear not.