That is one of my biggest fears too. To be permanently injured in such a way that even I am unable to ctb, let alone even stop anyone from intervening. That is a fate worse than death itself. If I were he, I'd do everything I can and exhaust all options to receive a dignified death or euthanasia, but failing that, raise as much hell and trouble for the people who are keeping me alive.
Also he didn't regret his decision, he regret that he failed and has to live like a vegetable. This is something that pro-lifers do not understand let alone acknowledge with regards to suicidal people. It's also really disgusting how pro-lifers make it seem like the person was glad to be alive and even make it a posterchild of their anti-suicide campaign! So disgusting, fuck them!