#4 Add multiple Superstars to the match
The WWE Universe is already demanding that a third superstar be added to the match between Brock Lesnar and Roman Reigns at WrestleMania 34 and while the move probably wouldn't change the outcome of the contest, it gives WWE a chance to up the unpredictability factor of the match.
In fact, if WWE were to do a match similar to that of the seven man Elimination Chamber match or like the fatal six way match for the WWE Title over on SmackDown Live, WWE could probably create enough reasonable doubt about Reigns winnng the title and make it a major box office draw.
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In the end, if WWE were to add a few of the stars to the match, it would give fans more of a vested interest in the contest and maybe even make it that much more amazing when Reigns eventually wins. Of course someone will ultimately have to be pinned by Reigns to win the match, but that seems like an easy decision to make, with Lesnar's impending exit from WWE.