The organ failure scenarios you describe are the ideal case. If you look at the more common ailments like heart disease, diabetes, gout, or tooth decay. The equ

The organ failure scenarios you describe are the ideal case. If you look at the more common ailments like heart disease, diabetes, gout, or tooth decay. The equation changes in favor of the current treatments. You would be hard pressed to convence me that the cost of growing, and implanting, a new tooth would be lower than a conventional dental crown or implant. I would love to be wrong. I would love to see the growth of spare parts reach mainstream use. But, I still believe their use will be artificially restricted, because of the cost of the skilled professionals involved and availability of proven alternatives.