I voted the 100-120 million range. I was relatively confident of something like that before today, and more confident now.
Some Switch owners will never get Switch 2, some consumers won't be interested in it, the game prices are going to sting if they're not reversed. $450 isn't great, but not as bad as $500.
I think it outsells Wii and PS1, but not so sure it surpasses PS4 and Game Boy+Game Boy Color. In the likely event Switch hits around 161 million (narrowly beating PS2), 110-115 million or so units for Switch 2 will be a big step down but not a disaster.
And keep in mind, Switch 2 could be replaced in 6-7.5 years, not the 8.33 years between Switch and Switch 2.
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: 40 million (was 60 million, then 67 million, then 57 million. then 48 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