This is a tough one to answer. The science fiction writer (and reader) in me sees the potential for this going in some very bad directions (first off, Brave New World). For example, the nutrient mix that a fetus receives can greatly alter the child they become. Secondly, if it became common, would many women prefer this to the inconvenience of a nine-month pregnancy? Will there turn out to be some benefits of a human womb we don’t know about. So I guess I see this to be a rather bad idea for humanity, but it offers some terrific story ideas for writers of dystopian science fiction.