Something I've really learned about the discourse on here is how unpredictable Nintendo is.
While most on this site didn't think Switch had much of a chance of getting much past the Wii and PS1 in sales, there were still plenty who thought even 100 million was very likely for Switch.
I'm well aware Switch is a hybrid (it combines Nintendo's typical two-platform approach), but I remember the Wii U days. Wii U was coming off of the Wii, had backwards compatibility and controller support, and it couldn't even sell as much as the GameCube. Early on in the Wii U's life, I figured GCN sales were the floor for Wii U. But Wii U just confused and didn't connect with a general audience. It even alienated many Nintendo fans. Why pay $300+ for a console with weak specs, weak online, and software droughts?
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 48 million (was 60 million, then 67 million, then 57 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