" Responding to one of Famitsu's questions, Nogami said the original plan for Splatfests was that they would run for one year only, but Nintendo was able to continue the Splatfests, although they now feel it's the right time to have them end, for now at least. Nintendo might have stopped having Splatfests, but that doesn't mean Splatoon is at its end.
The people at Nintendo still want to build excitement for the game through events such as Splatoon Koshien tournaments, nation-wide Japanese Splatoon tournaments. When asked about a possible sequel, Nogami said that Splatoon has grown with the fans, and they want to continue working with their fans in the event of a possible sequel."
It's great to see that Splatoon won't be completely dead until the inevitable sequels arrives. I really hope Nintendo will treat other future new IPs the same way, specially if they end up being successful.
Link: https://www.gamnesia.com/news/splatoon-producer-talks-about-splatoons-future-and-splatfests-in-famitsu-in
---Member of the official Squeezol Fanclub---