@hawkeye10,
Tough call, very interesting article and another in a series of interesting questions you've posed recently.
On the first part of your argument, it is not my responsibility to ensure the global gender balance in the world and the comment that the optimum balance of male to female is 1:1 doesn't match nature where the balance is very slightly male and subscribes to a particular family model of husband and wife. I'm sure there are parts of the world or times in history people might have said the optimum balance was one male to two or three women. While females are preferentially aborted in some countries, the article pointed out the wealthy caucasians tend to select for females so there it is males being screened out. If you are just talking gender, you would think that this is somewhat self correcting. A shortage of women should make women more desireable and eliminate practices like having to pay a dowry to marry off a daughter. I think the reality is much more complex and clearly we are early in this process since the technology is moving much faster than any demographic shift that might counter it.
As part of a larger issue, I see sex selection as similar to eugenics. If you can select for sex, why not eye color? As we learn more about genetics, you might be able to select for height, intelligence, propensity for cancer, etc. Do we really want to eliminate whole categories of humans for aesthetics? If everyone is beautiful no one is. If we screen out anyone who is subject to depression or autistism, do we stiffle the cutting edge of humanity where art and science innovation is most pronounced? Every super great mind and athlete is in some way a genetic freak.
I think these changes are coming and in general I think they are not good. Forget the issue of selective abortion since that ties into abortion in general, think about selective fertilization. What's wrong with sorting through 10 million sperm to five million you want. Or maybe just 1 million that will likely give you a healthy, beautiful boy with Dad's classic good looks and Mom's sharp mind. Humanity becomes a manufacturing process where we start with well defined raw materials to make babies, process them through a consistent education system and pump out uniform adults. I think that works well for cars where I want every Camry to be interchangable with every other Camry, but not with people where diversity drives society.