In fact when you combine stem cell technology with the technology known as tissue engineering you can actually grow up entire organs so as you suggest that sometime in the future you get in an auto accident and lose your kidney we'd simply take a few skin cells and grow you up a new kidney. In fact this has already been done.
God help us from those who believe that they are the sole possessors of truth. How we manage at times to agree willingly to become prisoners within our own minds and souls of beliefs and ideas on which we can never be flexible.