Since we were discussing it a few days ago following the Direct announcements, Nintendo is making some changes to Splatoon 2 to go with Rank X:
- from Ver. 3.0.0 onwards, new weapons will not be released on a weekly basis anymore. Instead, all the new weapons for a given month will be added at the same time, at the beginning of the month. This seemingly doesn't change the number of new weapons, just when they're added (so they're not slowing down support). Same for stages, they will still be roughly 1 stage per month, but now it will always be on the first day of each month
- basically, Rank X was designed so that players keep playing even after reaching the max rank, instead of focusing on just climbing ranks. Every month, there's a "reset", and players below a yet-to-be-defined threshold (presumably changing every month) will be demoted to S+9.
- more at the link (in Japanese, but I assume English post will come soon) >
https://www.nintendo.co.jp/switch/aab6a/rank/index.html
I feel those are pretty important changes, clearly focused on the long term.
Don't think the new release schedule for maps/stages will change much sales-wise, but the focus on making sure players keep playing as long as possible definitely will have a positive impact. After all, the more people play a game, the more people are talking about it, streaming it, etc.. There's a reason multiplayer-foused games have much better legs than SP-only ones.