Nintendo is fortunate enough to have numerous tentpole series, such as Mario, The Legend of Zelda, Pokémon (developed by Game Freak), Animal Crossing, Kirby, and, of course, the series that combines them all, Super Smash Bros.
Super Smash Bros. debuted in 1999 on the Nintendo 64, and has had four entries since: Melee, Brawl, Smash 4 and Smash Ultimate. As of today, this is the longest we've gone without getting a new instalment in the series: 2,418 days. This record was previously held by Super Smash Bros. 4 on the Nintendo 3DS, which was released 2,417 days after Super Smash Bros. Brawl (as pointed out by Meester_Tweester on Reddit).
Now, admittedly, this statistic is misleading considering how long series creator Masahiro Sakurai and his team worked on additional content for Super Smash Bros. Ultimate. The final character for Ultimate, Sora, was released on October 18, 2021, which was 1,046 days after the game's initial release. In reality, it has been 1,372 days since Ultimate ceased development.
Smash Ultimate has the potential to be timeless, and there's no pressing need for another Smash game in the near future. After all, Melee still has a very active player base and...