As for the rest of your argument, while I can certainly see why you are worried that providing the legal  basis for terminally ill people to end their lives may have negative impact and prove counterproductive for people just as sick but not willing to stop fighting the disease(s) and die, I am struggling to see the rationality in arguments that advocate the widespread conviction that if one is suffering from immense pain and there is no hope for them, they should nevertheless be stuffed with all kinds of medicines and kept alive at all cost for the sake of not letting them die even if that be their wish!