#1 Cena returns to WWE as a megastar
Despite becoming one of the biggest Hollywood stars of all time, The Rock managed to take some time off and make several appearances in WWE. He hosted WrestleMania 27 and went on to compete against John Cena in two consecutive 'Mania events. What if Cena shares the same fate?
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In case Cena's Hollywood career takes off following his appearance in Fast & Furious 9, he might get more lucrative deals, and kick off a successful career as a movie star. Just like how The Rock returned to WWE 7 years after his WrestleMania 20 match, Cena could come back a decade down the line as a major mainstream figure.
WWE could pit him against a future megastar in a marquee match at WrestleMania. What more, Cena could take enough time off to actually break Flair's record by becoming WWE Champion again, just like The Rock did in 2013.