In the actual case, the baby had compatible marrow, the teenager's life was saved and the parents were happy with their new baby. Cloning will be used to create armies or slaves. Armies and slaves can be created faster and more cheaply by other means than cloning. Women are necessary to bear and raise the clones, and most will not be willing. These clones could be made without heads, so they could be killed for organs without committing murder.
Clones are undeniably persons.
Furthermore, there is no need to create an entire human. Individual tissues or organs could be grown. A clone of Beethoven would be expected to produce an equivalent of the Ninth Symphony. A father might expect his clone to be his equal in sports. Everyone will suffer if clones do not live up to expectations.