The DS was cheap (the Lite was at any rate), had GBA compatibility, highly portable, and had unique software that was lightning in a bottle.
The Switch could very well sell more than the Wii. If it's really lucky, it will outsell the combined sales of the GB and GBC. But it's not touching the DS (pun intended). I don't see any hardware ever coming close to the DS and PS2, though PS4 has a good chance of being the 3rd-best selling video game platform.
Lifetime Sales Predictions
Switch: 151 million (was 73, then 96, then 113 million, then 125 million, then 144 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 57 million (was 60 million, then 67 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
