Personally, I've never gotten to play any Animal Crossing game, but to know that the same developers/team that brought us Splatoon had originally worked AC is getting me pumped to play it! But to said team, please please please don't forget about us Splatoon fans! When/if Splatoon 3 comes out, the support the fans will throw behind it will surely knock Nintendo's tentacles off!
In the meantime, I'm assuming Splatoon 2's competitive scene will still be going strong - perhaps up through another World Championship at next year's E3? Hopefully players won't forget about that side of the game, despite the lack of official game support from Nintendo after June. I wasn't around during the first game's post-support era, up until the second game's release, so not sure how the scene looked then or if it'll hint at what will happen now.