Dave Meltzer of Wrestling Observer Radio said the SmackDown plans for Mania have either changed or are "in danger of changing."
"I don't have a new card, but I do know those two matches I mentioned [Reigns vs. The Fiend and Cena vs. Elias], right now, look like they're off," Meltzer said. "What that means, I don't know. When I look at Bray Wyatt, if Bray Wyatt is to beat Goldberg, who else is there but Roman Reigns? There's nobody else."
Meltzer went on to speculate that The Fiend could go up against Cena or Braun Strowman. Aside from Wyatt, Meltzer mentioned Baron Corbin, Sheamus or someone "outside the box" for a matchup with Cena.
The Fiend is set to go one-on-one with Goldberg at Super Showdown this week. While it's mostly expected that Goldberg will be taking a loss in the matchup, it's possible WWE would feed Wyatt to a part-timer for WrestleMania season. We're only two years removed from Kevin Owens being fed to Goldberg to set up a Brock Lesnar feud for Mania.
Cena is one of the most sought-after actors in Hollywood at the moment, so it's hard to know how long he'll be sticking around after WrestleMania. He's expected to have some level of free time after The Suicide Squad wraps filming, and he has no other films confirmed to be in development afterward. If WWE wants to give Cena his record 17th championship reign—something that will almost certainly happen at some point—this may be the time.
In that case, a Wyatt-Cena matchup may be the way WWE goes for WrestleMania. A Goldberg-Cena matchup would draw some casuals in—and potentially keep the championship away from part-timers—but there would have to be workrate concerns. While Cena is still in excellent shape, he's barely wrestled the last few years and isn't in a position to carry a WrestleMania match himself.
It would be better for the quality of the show if Cena works with a younger, full-time Superstar.