After 2 INK-credible years of Splatoon 3, regular updates will come to a close. Don't worry! Splatoween, Frosty Fest, Spring Fest, and Summer Nights will continue with some returning themes!
Updates for weapon adjustments will be released as needed.
Big Run, Eggstra Work, and Monthly Challenges will continue for the time being.
Also they just released a video celebrating each splat-fest: https://www.youtube.com/watch?v=cd3qYJRnI7E
S2 was 2017, S3 was 2022. Five year gap is pretty reasonable for sequels.
S4 likely won't happen until after the next Animal Crossing, since it's the same team working on both IPs.
My issue with that is that Splatoon basically dies off for a few years until a sequel comes out. I'm not playing for switch online for a game that won't get any new content.
How many years do you expect them to keep pumping out content for the same game? They've gotta wrap it up somewhere. Two years is plenty.
Back in my day, games were released and we played them for what they were.
I would be happy with that if Nintendo didn't charge a yearly fee for online.