Duncan attended the LIHG congress during the 1947 Ice Hockey World Championships, where the CAHA asked for recognition of its newest definition of amateur as anyone who was not actively engaged in a professional sport and the proposed merger of the International Ice Hockey Association with the LIHG. At the 1947 general meeting of the CAHA, Duncan was opposed to the increasing commercialization of junior ice hockey and direct sponsorship of teams by the NHL. After the CAHA implemented contracts for junior and senior players, he felt it was recognition of the unofficial semi-professionalism of the CAHA.