Boxing films poor revenue?

Do boxing films of today total profit show boxing is waning in popularity in America and the world? The boxing films are making less money than they did many years ago when the big name boxers of the 70s, Foreman, Frazier, Ali, Holmes, were still active. Like Rocky Balboa, made 155 mill while the original made over 200 mill on a smaller budget. The cinderella man made a small profit compared to its original price. So does these poor profits, show boxings decline popularity?