This is very topical in the UK at the moment, as Parliament has just voted in favour of the Terminally Ill Adults (End of Life) Bill at its second reading in the Commons. What that means is that it will probably soon be possible for individuals who are slowly dying to request their own euthanasia.

There has been a lot of debate in the press and online (and no doubt also in private across the whole country). The arguments range from the risks of potential cooercion to the morality of a 'coup de grâce'. Yet your point is also pertinent, as 'quality of life' often has as much to do with the quality of care as it does with the affliction itself, and quality of care is largely down to how much society pays for it.