When will gene therapy be common in the us, and why was bush so opposed to it?

Hard to say when: Gene therapy is a huge ethical dilemma in this country tied to the idea of when life begins. If you believe that life begins when a sperm fertilizes an egg, then you would agree with bush that stem cells from embryos constitute murder of an unborn child. However there are safe alternatives from stem cells harvested from bone marrow. Until an agreement can be made on which to use, we'll be in limbo.