How far should we go?
The science might not be ready yet, but it seems likely that progress in field will enable us to change our own species.
We can't predict the outcome, even in out wildest dreams or worst nightmare, we'll always be wrong.
Are we afraid of uncertainties? Of course we are, evolution taught us to be.
Not doing everything we can would be in total contradiction with the behavior of humankind since the dawn of ages.
I am both an optimist and an atheist, there is no God and nothing is sacred.