I think we are too curious about genetics. we dont know enough about the human genome to go messing with it. unfortunately the only way to gain experience is by trial and error.
I think its way to risky, there is too much potential for a "GATTACA" type outcome to occur, even unintentionally. The US experimented with eugenics in the 1910s and 1920s, realize that if that had occured later, a good portion of us might not be here. It truly is a slippery slope, if we use genetics to cure cancer, then people will get obsessed with "curing" everything, and the best way to "cure" a problem is to prevent it from happening,
Doctor:"well mrs. chadmaster, it looks like your baby has a 95 percent chance of developing _________ syndrome, the law dictates i abort him, its essential for keeping the gene pool clean"
just keep in mind that hitlers favorite game was genetic purity. Those who forget history are doomed to repeat it.
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I don't know what the future holds, but I know Who holds the future.