Honestly, seeing the data, the fact that the console sells out almost everywhere, the fact that it'll surpass WiiU best year in a month... And that the console is way more attractive than the WiiU was imho. And they still have a lot of margin to make a price cut if needed. I don't see a possible scenario when the console doesn't perform well. Less than 30M seems pretty outlandish right now.
Make a prediction for NS's lifetime sales.
Prediction made in 14/01/2014 for 31/12/2020: PS4: 100M XOne: 70M WiiU: 25M
Prediction made in 01/04/2016 for 31/12/2020: PS4: 100M XOne: 50M WiiU: 18M
Prediction made in 15/04/2017 for 31/12/2020: PS4: 90M XOne: 40M WiiU: 15M Switch: 20M
Prediction made in 24/03/2018 for 31/12/2020: PS4: 110M XOne: 50M WiiU: 14M Switch: 65M