Although this is science-fiction material, in the recent past, things that were considered impossible are now possible. A man who couldn't walk was given cultured nerve fibres from his nose that helped him walk. This is because olfactory nerve cells are the only ones that regenerate. Scientists are also trying to unlock the secret as to why salamanders can regenerate body parts as well.
Surely, a clone of the person can be made, like a spare tire in the back of a car. This could be a good way to overcome donor recipient barriers. The brain can be preserved through cryonic, and provided that the ice doesn't damage the cells, nanobots can be used.
The technology would also help people for cosmetic reasons, an example of that being people in the transgender community.
I'm not sure why people think this is scary or bad, since its use would be to help people live a better quality of life. I predict that this kind of practice might start progressing elsewhere, and by elsewhere, I mean places not in the Western world, since they are more progressive in natural medicine.