My aunts cared for my grandmother and, the family being very large, younger aunts cared for older aunts when they became frail. Even an older aunt cared for a younger aunt (and her family) when she was dying of terminal cancer. Cousins have cared for elderly parents and I cared for my mother for the last years of her life in my home. My sisters-in-law were pillars of support for my mother-in-law.
My mother never became a burden, but it was stressful and restrictive looking after her. I hoped that as she became a very old and very frail lady that I would walk into her bedroom with a cup of tea one morning and find that she had died peacefully in her sleep during the night.
Eventually her body betrayed her to the extent that she needed 24-hour care and I couldn't do that. The place - not a full-time care home, possibly a halfway house to which she was transferred when the hospital wanted the bed - was very kind and full of gentle carers. I visited her pretty much every might and many of my cousins went to see her too. Nevertheless, she literally turned her face to the wall, refused food and drink and, not long afterwards died. I am not sure whether that was a good or bad way to die.
I have no idea whether she would have chosen an active death over a passive death, but I recognised that she really had had enough.
This, of course, has nothing to do with a six-month prognosis. I suppose this was planned as a first step, with a view to expanding the possibility of a chosen, dignified death to others who feel that they really do not want to carry on living.
It is very important to think about this.