(In my best Lisa Loud impersonation)
According to my calculations, by the 7th week of 2018, the Nintendo Switch had sold through approximately 11.474054% of its total yearly sales in Japan. If the same percentage were to hold for this year, the Switch, in Japan for the year 2019, would sell 5,214,251 units. Considering the software lineup Nintendo currently has planned, the chances of them selling these many units is more likely than unlikely, I would say.
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PlayStation/Xbox/Switch: 2022 Edition
PlayStation/Xbox/Switch Hardware Battle: 2021 Edition!
PlayStation 4/Xbox One/Nintendo Switch: 2019 vs. 2020
PlayStation 4/Xbox One/Nintendo Switch: 2018 vs. 2019
PlayStation 4/Xbox One/Nintendo Switch: 2017 vs. 2018
PlayStation 4: 2015 vs. 2016 vs. 2017