Nintendo Quarterly Results (Switch 52.48m, Pokemon 16m)

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Jranation said:
Omg! Splatoon is sooo close to 10mil!!!!
Everything did so well! But I expected FE3H to reach 3mil. Hopefully it still can before the next FE game.

It will definitely hit 3m this year, but there is a rumor that a Fire Emblem remake was in the works for 3DS and got moved to the Switch, which I could see coming out this year or early next. I would argue that Three Houses will hit 4m before the next mainline game as I personally do not expect to see that until 2022 or 2023, depending on how prioritized it is.

My guess is 2022 because of the success of Three Houses and Heroes.