A source speaking to the Wall Street Journal claims that Nintendo is looking to produce 25 to 30 million Switch consoles during their next financial year. Sales in the current fiscal year are expected to surpass lifetime sales of the Wii U.
https://www.notebookcheck.net/Nintendo-s-next-financial-year-might-see-25-30-million-new-Switch-consoles-produced.263546.0.html