Like Dwayne "The Rock" Johnson and Hulk "Thunderlips" Hogan before him, John Cena's path from the professional wrestling ring into movie stardom is heating up. After turns in films like Bumblebee and Blockers, Cena next eyes the Robert Downey Jr. vehicle Dolittle followed closely by The Suicide Squad and the granddaddy of Big Beefy Boy franchises, The Fast and the Furious. But even as a 42-year-old with plenty of back-body-drops into plywood in his past and blockbusters in his future, he still often hears that question: When is he returning to the ring? When Collider'…