As a doctor, my view on this was different before medical school (unquestioningly pro) and now I'd be the person ending someone's life (hesitant).
Family pressure is a real issue regarding inheritance. Especially if someone with their eye on the will has POA for both health and finance - could they then decide to end the patient's life on their behalf for their own benefit?
I would prefer proactive elderly care planning. That means DNACPR discussions constantly occurring once illness is present. Downsizing homes so they are more appropriate for adaptations needed for disabilities. Established ceiling of care for the frail and chronically ill (e.g. "will have oral antibiotics in the community but not IV in hospital if develops pneumonia", with as many specifics as possible). Often nothing at all is done until a massive health crisis and then the family says they can't cope, so an intense care package needs to be magicked out of thin air. There is almost always a long history of deterioration and not coping.
My hospital has over 300 elderly inpatients and most are awaiting a community care package. A lot will deteriorate and die before they get there.
We all have a responsibility to support elderly family members to plan for the future. Nobody wants to go into a care home but it beats slowly dying in hospital with a delirium, broken hip from a fall and pressure sores because we have no staff to turn you. That is the reality now.