Let's be honest - people were even more freaked out by the idea of "test tube babies" a few decades ago. Then, when the world didn't end, and they started meeting people who were actually conceived in-vitro and seemed perfectly normal, they changed their minds.

This is exactly the same way "Enhanced Humans" are going to play out as well. The public is going to be freaked out, but some people will do it anyway. Either locally, or in some foreign country. With time, people will realized that these "Enhanced Humans" are their friends, neighbors, co-workers, and perfectly good people, and their barriers will start dropping. And when the time comes when they have the opportunity to enhance their baby's health/intelligence/fitness, they'll think it's plain irresponsible of them not to do so.

Unless you're worried about regulatory bans, "public fears" are pretty much meaningless. If you can build it, show that it's safe, and demonstrate compelling benefits, the public will change their minds soon enough.