#2 His main roster run has become stale
Over the past few months, Seth Rollins has spent the majority of his days as the Universal Champion. His incredible title victory over Brock Lesnar at WrestleMania 35 is still one of the most memorable moments of the show. However, the following months weren't nearly as memorable for Rollins. The crowd slowly started turning on Rollins and 'The Architect' addressed this fact on Monday Night RAW when he pointed out that many fans were happy when he lost his title to The Fiend at Crown Jewel this past month. He wasn't lying either. It's painfully obvious.
The fans are no longer as invested in Rollins as they used to be. They expect something new from his character and WWE's Creative Team has failed to provide that. 'The Kingslayer' has already faced almost the entire RAW roster and it doesn't seem that there is an interesting storyline left for him on the show. However, things could change if he joins NXT.
Young talents are waiting to feud with a Superstar like Rollins and in the Black and Yellow Brand, Rollins could also challenge for the NXT Championship. A feud with Adam Cole could prove to be outstanding and would certainly add interest to both NXT and Seth Rollins.