2016 is probably the all-time worst, but 2011-2012 were pretty rough too.
The Wii's first and third party support were very much dying from 2011 onward, and the 3DS and Wii U had underwhelming launches (to put it politely).
Lifetime Sales Predictions
PS4: 122 mil (was 100 million) Xbox One: 55 mil (was 50 mil) Switch: 79 million
3DS: 77 mil (was 73 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima