Immortality is at our fingertips. Rejection of a cloned organ would be close to zero. For those who opt out for a whole body transplant, the operation for transplanting a head to another donor's body has already been performed successfully. The chimpanzees in the procedure lasted only a few days though. Better surgical techniques are now in place that would make it logical to do a whole body transplant. The only hurdle remaining on this procedure is to reconnect the spinal cord to the donor body through surgery or with nerve regeneration techniques.
The original medical research was carried out in the hopes of finding medical surgical techniques to restore a quadriplegic to full mobility.