#5 Should not retire - John Cena
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John Cena is unarguably one of the greatest Superstars in the history of WWE. Cena was at the top of the mountain, as the face of the company for more than ten years - longer perhaps than anyone in the history of WWE.
Hardcore fans might complain about his limited move set and a stale gimmick, but even they have to begrudgingly admit that there are extremely few Superstars on the current roster who can match Cena when it comes to connecting with the audience through his promos. Even in the ring, in spite of his limited moves, the in-ring psychology that Cena brings with him every time ensures that the audience is invested in his matches throughout.
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Even now, his sporadic appearances are certainly a big deal and hard as it is to believe looking at how rare his appearances have become, he is still the second best merchandise-seller in the company, only having been recently overtaken by Roman Reigns. A feud with John Cena will elevate a Superstar to the main event scene, and looking at the shape he is in, it feels like Cena still has quite a few feuds left in him.