A note that doctors would also have an ethical barrier to this, as they've sworn to 'do no harm'.
I personally am indifferent to this. Besides, couldn't a doctor simply prescribe a lot of morphine (intending it for palliative care), and have it used to intentionally overdose? I recall my great-aunt was given a lot of morphine shortly before she passed away from pancreatic cancer...
the Hippocratic Oath prevents a doctor from harming a patient, but there is a point where the patient's health is degenerating to such a point that by
not euthanising, the patient actually suffers more. In that sense, what is more harmful?
The big problem with euthanasia is the problem of slippery slope (or thin edge). How does one judge if the person is making a rational decision about ending his/her own life? How does a patient unable to make that rational choice be administered? Does a third party have any power in this decision?
and from that point on, the line becomes less and less distinct... The end of the slide may be as absurd as euthanising a midget in his/her youth because of the "emotional trauma" he/she may likely experience...