Next of kin might be convinced to let the doctors take a part here and there, but how many are going to consent to feeding their loved one’s body into an industrial process in a faraway city? What do you bury? A receipt?
In order for this scheme to work, the opinion of the next of kin must not matter. This is a decision the State would make for its own convenience and efficiency.
My mind can't comprehend sitting by the phone day and night, waiting and hoping for someone to die so that I might extend my life a few years.