With some people, the most reasponsible decision they'll ever make is to abort a pregnancy. You still haven't adressed how you're going to care for half a million unwanted babies each year. What are you going to do with those kids?
There are many, many parents who are on waiting lists trying to adopt a child. Some even go overseas to find an infant. Most are willing to pay the bills to carry and deliver the child. I suspect the problem would not be as you envision.