As I understand it, no flesh-and-blood child would be shut off from salvation, no matter in what way they were born. It wouldn't be the fault of the child, no matter what evil their parents (or parent, singular, perhaps in this case) had done. I think we see that in King Josiah - he was the son of Amon, the son of Manasseh, both men who didn't do right in the sight of God, yet young Josiah "did what was right in the sight of Jehovah, and walked in all the way of David his father, and turned not aside to the right hand nor to the left." (). He was, in figure, someone marked out as displaying the Spirit of Christ, the true David, rather than the disposition of his evil father and grandfather.
This science though, there's no doubt in my mind that this is an evil development. Men trying to overturn the natural ordering of life which the Creator has established. That's always been the devil's way though, hasn't it? To oppose himself to everything that God has established. I don't know whether God will allow this or not. However, Lanolin is right: we shouldn't be troubled by it, or be overly occupied with it. We're looking to our returning King, who'll set everything right, executing judgement and justice () on all the impious things that the world is determined to go on with, putting an end to them.
Complicates, that's exactly the word to use here. Man is always complicating things. How simple and practical is God's way of life for man - how simple and practical life would've been for Man in innocence in the garden. But sin came in and complicated everything. Satan began it all by raising a question, and he carries on in just the same subtle way: "Yea, hath God said...?" "Does it really have to be like this...?" "Why don't you try your own way...?"