#4 Roman Reigns

The man who retired Undertaker and the current IC champ, Roman has had a rock solid 2017. While he was not always in the main event, he was always near the top of the card. The fact that Vince McMahon has said Roman is the 'next John Cena' certainly didn't hurt.
But he lost some momentum when he was forced to take a leave of absence due to illness. Now holding the lesser belt on Raw, he may have to claw his way back up to the top.
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Chances of him ruling 2018:
Pretty good, even with recent setbacks. Roman is a polarizing figure, generating at least as many boos as cheers, but that never stopped WWE from pushing Cena to the moon. Expect him to rise to the top of the Shield as their main singles star.
Rumors abound that he will replace Finn Balor in the Wrestlemania main event to challenge Brock Lesnar for the Universal title once again. As long as he's Vince's favourite, you'll be seeing a lot of Roman Reigns.
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