It's been upon us for a while - since the successful treatment of X-SCID by genetic modification of the infants' bone marrow 15 years ago. Since then, there has been prolonged, if not permanent partial correction of inherited blindness by subretinal injection of a gene therapy vector, partial correction of haemophilia B by intravenous injection, and numerous other clinical successes. If you mean gene editing, then I don't things are ready quite yet.