RE: Ethical question
Take him hunting and enjoy the time you have left with him. I would not even broach the subject of a license to him. He is your mentor and you have been hunting with him for numerous years so you know how he stands on licenses and government intrusions. He is not hurting anyone at all by his actions. I understand his feelings and would respect them for as long as he is alive.
If he really wants to stick the government, have him sell is property to a relative (s), friend, whatever, for a dollar. Then the givernment cannot take their 45% in death taxes.