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Central to Doomcock's theory is the introduction of the World Between Worlds—a mystical dimension first seen in Star Wars Rebels. This realm allows users like Ezra Bridger to traverse time and space across different points in history, effectively serving as a kind of time travel in the Star Wars universe.
According to the rumor, Lucasfilm might leverage the World Between Worlds to create an alternate timeline for the sequel trilogy, thus making those films non-canonical. The idea is that the existing sequel films could be reclassified as Star Wars Legends, akin to the expanded universe material prior to Disney's canon reorganization in 2014.