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I propose a theory that the themes of the Ninjago movie and the Lego Batman movie contributed to the decline of Nexo Knights.
Consider this: all three themes had significant set releases in 2017, with both Lego films featuring extensive lineups of sets, while Nexo Knights introduced a new villain faction, the Rock Storm Monsters, which was quite intriguing. However, the sets from Ninjago and Batman were perceived as more appealing. Had the sets from these films been postponed to 2018 or 2019, Nexo Knights might have remained a lasting theme, as it would not have faced such formidable competition.
This leads me to believe that Dreamzz has the potential to become a lasting theme as well, with sets likely to be produced well into 2026 and beyond. Ninjago, Dreamzz, and Monkie Kid represent the future of Lego.