Thought was given to that, and “incurable” has the same connotations as “irremediable”. In that same proposed section, paragraph (c) does refer to “enduring physical or psychological suffering that is intolerable to them and that cannot be relieved under conditions that they consider acceptable”. I think that speaks to the point that you've raised, so it's contained there.
On May 2nd, 2016. See this statement in context.