There should not be a third match. Fury was robbed by crooked scorecard judges in the first match. Maybe Wilder and his pride might want a third match but the team know their man will lose and maybe get more heavily punished next time..
Fury got knocked down twice during the first match and you think he is still worthy to win the match? Even if he dominated most of that fight Wilder equalized it by showing in front of the watched including the judges who has the power in the ring. However I do have to agree with you that a third match does not need to happen since we already know now who is the best in the ring and Fury showed that he can avoid the errors he have made during the first match. But it's really not the fighter's choice if they want another rematch from happening since if the fans are talking for another fight they know these boxers and promotes see money that will be pouring in onto the next possible fight.