This is an interesting issue. Whether it was a real suggestion or just a through-provoking thought experiment, it still brings up the main arguments for abortion, and raises the question of to what extent convenience and utilitarianism are the proper basis for morality.
I, of course, think that infanticide is horrible, and that there is a reason why it gets such a visceral response, and that we need to listen to that response rather than try to reason ourselves away from the aversion. Put another way, that this type of thing still shocks us is a good sign. This may not always be the case. What liberals today scoff at as a straw man position of the right may be the liberals' actual position tomorrow.
That is all.