I am afraid that this kind of research is going to continue simply because there is not a large enough moral consensus present in society to prevent it. We have become too powerfully driven by the personal end in mind to repudiate the means to get there. But until the culture at large turns its attention from the immediate gain and considers what is right, the ethical slide will continue. Moreover, there is the even more questionable and fear-provoking question of whether true human cloning is feasible. True cloning, as opposed to artificial twinning, is much more involved.
Cloning is a technique that is partly successful in frogs.
Frogs can be cloned by collecting eggs from a female frog. The nucleus in the eggs is destroyed by irradiation. Next, cells are isolated from the intestinal lining of a tadpole. The nucleus is removed from the intestinal cell and placed within a previously enucleated egg. The egg now has the opportunity to begin cell division and development.