Hum... for or against, I expect this to happen anyway for real, it is just a matter of time. Will it take 10 or 50 years, as a commercial product (after all there are already weird surgery requests) of after an accident similar to science-fiction (activists who are against and make it happens to prove they were right), I could not say but definitly it will happens. Why? Think about magic : all magics, human try to use technology to make it real. And this one doesn't seem to me to be the most difficult.