It could be used for any genetically linked trait such as eternal appearance, personality, or physical enhancement. These concerns will have to be dealt with in time. The cost of gene therapy is high at this time and could be a concern for families with that need lifelong treatment and do not have health care. Gene therapy will probably be cheaper in the ling run since it is a one time only procedure. It will eliminate suffering for the individual and possibly their children.
Invasion of privacy is also a concern for many.
Insurance companies could make it mandatory to have genetic screening before a policy before they issue a policy. This could cause discrimination to families with genetic diseases. Or potential employers could question a person's genetic background and pass them up for a promotion or job. These are all good reasons to use gene therapy and eliminate the controversy before it starts. The last and most important concern is the risk of the procedure.