#1. Beating The Fiend
We consider this to be a scenario less likely to happen, but the reality is that the history of WWE's booking of Bray Wyatt doesn't rule it out as a possibility. Of course, the circumstances this time are entirely different, but we mustn't forget that it was just a month ago when most of us were sure that there was no chance of Goldberg defeating The Fiend and becoming Universal Champion.
The thought process was that Roman Reigns vs The Fiend was certain for WrestleMania and that Goldberg was only returning for a big payday in Saudi Arabia. Yet he managed to squash The Fiend in five minutes after 10 months of building Wyatt up as an unstoppable monster heel.
Goldberg's Spears weren't even that impactful, to begin with, and we still can't see the reasoning behind the decision of having him go over. Do remember that Wyatt was supposed to go over John Cena in WrestleMania 30 but he didn't. He was also supposed to go over Randy Orton at WrestleMania and as mentioned, WWE has always pulled the plug on him in the most important moments.
While we can't understand any reason why Cena should win the match, beating Wyatt would certainly be a big way for him to stun them.