I will not be surprised if 2021 Switch in the first 3 months (Jan,Feb,March) is up YOY since those months in 2020 were pretty average before the Pandemic and Animal Crossing hit. The 2021 sales numbers after March will definitely determine whether 2021 will be its peak or whether Switch sales will begin declining.

March has MonHun, so I still believe Switch can keep up with last year. But later the year this will start to look differently.

I haven't been keeping an eye on sales long enough to know how much of impact MonHun has on sales, how large is the spike and how long is it sustained are really my only question.

Edit:I just looked at monster hunter 4's release on the 3DS, quite a difference, and it lasted a while.

If NSW 2021 keeps up with NSW 2020 this quarter that would be insane. I’m still seeing 1300k-1500k. Hopefully it does get close. ACNH did 680k hardware in 2 weeks

March has Monster Hunter and April gets the new Pokémon Snap.

That 2020 momentum is rolling on into 2021 and this time there's no early year drought to wear it out with the likes of Monster Hunter Rise, Bravely Default II, 3D World + Bowser's Fury, and Pokemon Snap in just the first 4 months of the year.

Top 30: https://nintendoeverything.com/famitsu-software-sales-1-4-21-1-10-21-top-30/

1. [NSW] Momotaro Dentetsu: Showa, Heisei, Reiwa mo Teiban! – 87,087 / 1,510,537
2. [NSW] Animal Crossing: New Horizons – 45,124 / 6,517,609
3. [NSW] Ring Fit Adventure – 44,282 / 2,202,001
4. [NSW] Mario Kart 8 Deluxe – 34,027 / 3,575,063
5. [NSW] Super Smash Bros. Ultimate – 24,189 / 4,092,228
6. [NSW] Clubhouse Games: 51 Worldwide Classics – 21,086 / 586,089
7. [NSW] Minecraft – 19,933 / 1,760,384
8. [NSW] Pikmin 3 Deluxe – 14,069 / 513,225
9. [NSW] Splatoon 2 – 13,895 / 3,732,158
10. [NSW] Super Mario Party – 12,885 / 1,787,548

11. [NSW] Pokemon Sword/Shield – 12,057 / 3,919,364
12. [NSW] Super Mario 3D All-Stars – 11,021 / 536,634
13. [NSW] Pokemon Sword/Shield + Expansion Pass – 9,661 / 181,784
14. [NSW] Sakuna: Of Rice and Ruin – 9,218 / 109,881
15. [NSW] Fitness Boxing 2: Rhythm & Exercise – 7,781 / 49,880
16. [NSW] New Super Mario Bros. U Deluxe – 7,710 / 1,013,202
17. [NSW] Zelda: Breath of the Wild – 7,305 / 1,748,951
18. [NSW] Super Mario Odyssey – 6,983 / 2,197,429
19. [NSW] Hyrule Warriors: Age of Calamity – 6,648 / 326,454
20. [NSW] Puyo Puyo Tetris 2 – 6,234 / 77,092
21. [NSW] Super Mario Maker 2 – 5,249 / 1,054,338
22. [NSW] Family Trainer – 4,860 / 32,053
23. [NSW] Dragon Quest XI S (New Price Edition) – 4,508 / 46,571
24. [PS4] Call of Duty: Black Ops Cold War – 4,309 / 162,275
25. [NSW] Fishing Spirits: Nintendo Switch Version – 4,048 / 559,406
26. [NSW] Human: Fall Flat – 3,986 / 101,700
27. [NSW] Dr. Kawashima’s Brain Training for Nintendo Switch – 3,808 / 355,040
28. [NSW] Taiko no Tatsujin: Rhythmic Adventure Pack – 3,802 / 64,948
29. [NSW] Derby Stallion – 3,745 / 121,740
30. [NSW] Luigi’s Mansion 3 – 3,442 / 737,965

NS - 29

PS4 - 1

There's always that one PS4 game preventing clean sweeps. In a way it's kinda funny the PS4 is consistently getting 1 now.

There are 9million PS4 owners. Im sure many of them are buying a new game to play....... 

I know, I just find it a bit funny how consistent it's becoming that only one non-Switch game is getting into the top 30.