Nintendo Switch has sold-in (shipped) 14.86 million, 3DS 72 million, Nintendo's FY 2017 Nine Months Earnings

[Barkley]

Wyrdness said:
Imagine if the Switch goes this route

Wii U outsold in 2017
GC and N64 outsold in 2018
N64 and SNES outsold in 2019
Nes outsold in 2020
3DS and possibly GBA outsold in 2021

I think that's all doable. N64 in 2018 would be the hardest.