The whole time I was reading this, Mary Shelley's "Frankenstein," along with the movies, were running through my head. The implications are so incredible, I can't even wrap my (healthy) brain around them!
Hearts, lungs, kidneys, livers -- none of these carry any sentient qualities, but the brain is the seat of consciousness! I don't think anyone with any kind of moral or ethical center would consider a brain transplant to be anything other than unthinkable.
This is the kind of science fiction that scares people.