I really hope you're right. The idea that someone in that sort of condition, apparently beyond further harm, could actually have been conscious for all those years, makes the average horror story look optimistic.
We don't know that such a person couldn't eventually enter an inner world where they find a kind of peace and fulfillment. It doesn't necessarily have to be a continual conscious horror of being frozen in a hospital bed.
What if they learn to meditate like a monk? Certainly there are people who can enter altered states of consciousness for extended periods who could perhaps tune out the torturous effects of any sensory deprivation.