I think it would be very difficult to give an answer to that question until one is in that position. I do not fear death but feel I could never be ready for it, even if I did know when the end was near, on the other hand, I think if I would be in a lot of pain and need constant care, I might welcome death. My issue would be how to convince my children and grandchildren that they will be ok without me, especially my daughter and grandson, whom have been living close to or with me all their lives.
Something like this makes me realize that I need to get a 'living will' made up. I would not want to be on artificial life support. My life support is my faith in God.