If scientists could design perfect health into our children, should we do that?

In the near future, it may become possible to manipulate human genes in a way that would make us immune to most or all known adverse medical conditions. The advances in biotechnology are moving even faster than the advances in computing power. We will probably see this capability in our lifetimes. Almost certainly our children will see it.

Would it be dangerous to eliminate disease and disorders? Can human pathology be advantageous; either to individuals or to society as a whole? If you could have access to perfect health, would you take it?