Yep. The new material is internally consistent, but of course you're going to lose the people--and I'm pretty sure this would be a majority of all people--who have a strong moral intuition against infanticide.
The new material is internally consistent, but of course you're going to lose the people
One of my unstated goals is to show that both speakers are wrong about personal identity; the pro-lifer is incoherent or absurd, and the other is consistent but as you point out infanticide clashes with naive intuitions. The second is 'less wrong', but that's still not 'all right'.
A few years ago, I wrote a little dialogue I imagined between 2 materialists, one of whom was for and one against abortion, centering on the personal identity question. I recently cleaned it up and added a number of references for the biological claims.
You can read it at An Abortion Dialogue.
Early feedback from #lesswrong is that it's a 'nicely enjoyable read' and 'quite good'. I hope everyone likes it, even if it doesn't exactly break new philosophical ground.