I don't like it, but I have to admit you're most certainly correct that it's only a matter of time before human genetic-enhancement is commonplace. Best case, we'll be living in a Gattaca-esque world before the end of the century.
That best case is still a horrible future.
And then the next thing to debate is whether he really had a heart condition or not. People come down on both sides.
That is one of the reasons why I love that movie, Ethan is the bad guy. Though that's probably not what the director was going for.
He and his compatriots were dealt with as any other traitors would have been while being caught in mid coup.
We don't really have evidence for what happens when a generation of much-stronger, much-smarter than average humans are born, and subsequently give birth to another generation of even stronger even smarter kids. I'm hoping it's not a bunch of sociopathic Khans and that if we can figure out how to make smarter babies, we can also avoid making sociopathic murderous ones.
EDIT: On the other hand, I'm seeing the fear now - we create 100 of these superkids, and it turns out sociopathy is simply more fit than non sociopathy. They use their superior intelligence to out-perform "normal" humans, breed more of themselves, take over the world, and "normal" humans are gone.
Bad for normal humans, good for... whatever humans are after?
I guess it comes down to whether you're willing to accept that the continuance of some version of the human race is better than the potential extinction of all of the human race (which I believe is inevitable if we don't start making changes like this).