#1. A John Cena heel turn leading to Roman Reigns turning face
This seems like an unlikely scenario should John Cena and Roman Reigns rekindle their rivalry. Cena hasn't turned heel in over a decade-and-a-half, and there seems to be less incentive to do so anytime soon.
However, WWE could utilize him to establish Roman Reigns. When the two had a rivalry last time, they didn't lay hands on each other until their match at No Mercy. But the timing of it was wrong, and the attempt to establish Reigns backfired, since Cena humiliated him in his promos.
It was clear that Roman Reigns was nowhere near the level of John Cena, but the dynamic has shifted now. The latter is expected to return to WWE for a program against The Tribal Chief at SummerSlam, and it could be the perfect opportunity to turn him heel.
Since WWE isn't dependent on Cena anymore, there's nothing left to lose. While it may seem unlikely, the shock of a John Cena heel turn would likely propel Roman Reigns into becoming a popular babyface.
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