The Switch has been very unpredictable. 2022 could be as low as 18 million units, but could be around 25 million as well depending on supply and demand.
I voted 18-22 million and I think right around 20 million will be the total. PS5 and Switch will be closer in 2022 because Switch will sell less compared to 2021 and PS5 will sell more.
Lifetime Sales Predictions
Switch: 144 million (was 73, then 96, then 113 million, then 125 million)
PS5: 105 million Xbox Series S/X: 60 million
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima