Here's the problem with slippery slope arguments. You could substitute all medicine and your point would still stand. Do people with a limp need to be "fixed" or does it add character? You know who is the right person to decide that? The person receiving the therapy, or if they are a minor, their parents. Nobody else is well equipped to make the decision for them.

I suppose I could be wrong, and this could be the start of Gattica, but I highly doubt it. I think far more likely is that over the next few decades, millions of people will be able to hear who otherwise would not have.