Not that it changes the moral problems that exist as a result, but considering the socioeconomic status of most women who've had those abortions, I don't know that too many of those would have grown up to be homeowner material.
They never-the-less would need some place to live. From what I've seen of abortion statistics, I suspect millions of the 50 million cumulative abortions would have been born to middle and upper middle class women.
An indirect observation is that when you take a drive through certain ethnic communities, you see lot's and lot's of children running about. Whereas in other communities, there is a noticeable lack of children seen running about.