Will Cell Biology and Stem Cell therapy seal the fate of conventional medicines?

While it may open an entirely new horizon and set a paradigm in healing, treatment and theutics, it could also be an harbinger to altogether new set of maladies connected with souls, cells, bizarre like teratoma, body in body, soul in soul, unexhorcisable souls inside a body and other unethical existences or will it simply be the magnum opus of healing technology. I believe for an intended and focused treatment Adult stem cells have immense scope whereas embryonic will be an uncontrolleble proposition like a nuclear gas leak. What is your opinion?