#2 The Roman factor

WWE is slowing building Seth Rollins for a rumored match-up against Brock Lesnar at WrestleMania 35. Roman Reigns during his relentless pursuit of the WWE Universal Championship, made it a point to call out Lesnar for his part-time schedule.
Reigns wanted to dethrone Lesnar and bring back the Universal Championship to RAW. He wanted to be the fighting champion the fans wanted, and he did exactly that albeit for a very short term.
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Seth Rollins is the perfect individual to continue Roman Reigns' pursuit, and this story could play off really well with the audiences. Seth Rollins setting out to achieve his dream as well as Roman Reigns' will make for a perfect storyline.
Rollins dethroning Lesnar and hoisting the championship will make for great visual, and a satisfying conclusion to WrestleMania, for the first time in over five years.