Hmmm...I've no technical backup to support this one, but...
No. Fucking. Shit.
Look at what we do with prosthetic limbs nowadays. Most people, if they are willing to shell out a bit of cash, actually see an IMPROVEMENT in their performance post-prosthetic.
And, as the technology becomes more refined, grafting a mechanical arm onto a severed nerve and linking it to the brain isn't Sci-Fi, it's ten years from now.