That is presuming human cloning is not considered unethical on its own.

Who would birth the (almost) babies by the way?

How do you sustain them to grow the organs?

We have serious trouble with keeping fully grown people in coma alive, much more with damaged neonates.

And toggling a switch can cause side effects. We still do not know enough about early development.

Or that you can keep mostly dead bodies alive by some means and not, say, get buried, cremated or taken apart for transplants.