Yeah, I knew someone who opted to have their dementia-suffering parent live with them until the end. That was tough, but... surely better than being left alone in a hospice/etc. as you mention. Unfortunately, yeah, you'll see the person just erode and ... it's really brutal as hell, ultra sad. Eventually the person is not even capable of consenting to euthanasia (nor any other medical procedure). Definitely something to discuss with family or closest friends especially upon getting diagnosed with an illness like that.
Caring for dementia patients at home is seldom better unless the family has the resources for 24×7 care. I know from personal experience that dementia patients will wake up in the middle of the night to wander out into the street or accidentally start kitchen fires. And if the family tries to do it all themselves it takes an enormous unsustainable toll. At some point everyone is better off putting the patient in a professionally staffed facility. Of course the prices for those create other challenges.
I have worked in hospice and would say typically the people who end up there are not what I would say left alone. But they are there to die. They usually end up there because the family who was looking after them is really struggling to do so any longer for various reasons like personal care or medication management being too much and they are approaching death.
When there they get basically as much drugs to fight pain, anxiety and other symptoms as much as they need. The goal is to provide as much as possible a comfortable end to their life.
Dementia patients are not candidates for MAID program here in Canada. You need to be of sound mind at this time. Perhaps in the future one can make a living will for future illness but currently if you are confused or suffering from dementia and can not understand what it is all about you can not consent to it.
