Plain and simple, no machine will EVER replace a human being. It can come close, but it can never rationalize a situation....it can only respond as it has been programmed....even so-called "learning" computers. On a completely closed track with no possibility of outside influence, a completely uninterruptible power source and uninterruptible communications links to the controller and all vehicles controlled by a master computer with a master program...maybe. But let's face it...we still can't even make a phone call without it dropping from time to time....