https://www.polygon.com/2017/10/30/16570130/nintendo-switch-sales-quarterly-earnings

Nintendo expects to sell 14 million Switch consoles by the end of its fiscal year, an upward revision that would surpass the entire lifetime sales of the Wii U.

As it is, Nintendo has already sold 7.63 million Switches, more than half of the 13.56 million Wii Us sold from its launch to the end of Nintendo’s last fiscal year concluding in March 2017. The Wii U’s production ended in early January.