Super Smash Bros. creator Masahiro Sakurai has hinted that Super Smash Bros. Ultimate could be his last in the series. His comment regarding the possibility can be read in full below:
“The biggest appeal of this game is really that everyone – every single fighter – is back here. We may continue the [Super] Smash series in the future, but I don’t know if we’ll ever be able to pull this off, so I really hope that you’ll enjoy this iteration of the game.”
Pokémon Blog 