#2 Goodbye, WWE
As discussed before, movies like Fast & Furious always tend to do amazing business, no matter what the critics say. The 9th installment of the hit franchise will be a blockbuster hit next year, and it could possibly mean a great deal for Cena.
In addition to the movie getting a good response, what if Cena's performance gets praised too? This would result in the movie producers signing him up for future editions of the franchise, and he could very well end up replacing The Rock! Being a part of a franchise such as Fast & Furious could result in Cena becoming a Hollywood mainstay on a permanent basis, but where would it leave WWE?
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It's entirely possible that Cena's performance in the movie could lead to a chain of events, which would result in him never coming back to WWE.