That's why I talked about the timing of when you have to be competent. It's to suggest you could make the decision, the request, before the intolerable suffering actually arises, and in that declaration you would state what you consider to constitute intolerable suffering. Otherwise, once you're past that point, who is any of us to assess whether that person is facing intolerable suffering? It is for the person, so they dictate that in advance.
On January 28th, 2016. See this statement in context.