Most JWs will watch and forget. The year 1975 isn't even mentioned, so some, especially the public, Bible studies, young JWs might not even be aware what they are talking about. Perhaps it was just some crazy people in that man's congregation or circuit for all they know, not an organizational problem.
Those who are vaguely aware of 1975 will simply repeat the line Watchtower gives them. Some individuals ran ahead, were seeking a date, ect...