Our Post-Darwinian Future;
Pluripotent stem cells, gene targeting, and artificial chromosomes could leapfrog over evolution and let us take control of our genome, maybe even turn ourselves into a whole new species. “There is no scientific basis for thinking that we couldn’t,” Silver says. “There’s nothing really special about the human genome. There’s nothing that says this is the end.”
more from the article:
"Who should have the final say on when and how the human genome should be changed?

On the other hand, if technology can enable us to eliminate disease and disabilities from our children or insert genes that might make them smarter or better looking, why wouldn’t we use it?"

We need to let Darwinism work.

So do we define what it is to be human by our limitations? We have the ability to influence our own evolution, ability given by a brain capable of contemplating it's own existence among the cosmos. Our potential is probably unlimited. How else can we make progress?