Anyone remember the Lockerbie bomber? Dead in 3 months?
I don't think anyone truly believed that the Lockerbie bomber was so close to death. As it turns out, they were right and the whole thing was a bad joke.
This guy, on the other hand, isn't just paralyzed, he's "Christopher Reeve" paralyzed. Inside or outside the cellblock, he's a prisoner until the day he dies. I think the only risk would be that sometime between now and then they figure out a way to cure neck-down paralysis. This scenario seems unlikely.