Animal Crossing will drive sales of consoles, especially the Switch Mini, and will bring in a huge new (casual) audience.
I imagine a AC themed Switch Mini bundle selling for $250 this Christmas. $300 with a couple of villager Amiibos.
And Nintendo will push their online service with the game.
Additionaly there will be other casual games like Professor Layton, Brain Age, Art Academy, Endless Ocean, Nintendogs, The Sims & Switch Sports. And Pokémon.
This year will be the Year Of The Casuals. 2020 will be the year of Bayonetta, Metroid, Kid Icarus, GTA V, COD, Final Fantasy and Resident Evil.