Humans don't die a whole lot before reproduction anymore.
Most people get to reproduce and have babies.
I can't say i agree that genetically engineering humans is a good thing. It's been suggested that it will help the human race evolve, but it's more likely to send us back in time, to an era where the rich were well educated and stayed rich and the poor were condemmed to stay poor. The reason I say this is that at least at the beginning, Genetic Enginering will be expensive. Only the rich will be able to afford to engineer their children, and I doubt they'll wish for a normal kid. No, their kids will be the prettiest, the best built, have the highest IQ's.