Let's see how many units are sold during holiday season. Also if the new Nintendo console gets out, then the old Switch will get (hopefully) a discount and it sells a lot more. Keep in mind the PS2 and DS sold even after their successor came out. Wikipedia lists the numbers: https://en.wikipedia.org/wiki/List_of_best-selling_game_consoles
PlayStation 2 Home Sony 2000 >155 million
Nintendo DS Handheld Nintendo 2004 154.02 million
Nintendo Switch # Hybrid Nintendo 2017 143.42 million
And just for fun, people call the Xbox One a failure, but look and compare to some legendary consoles:
Xbox One Home Microsoft 2013 ~58 million
Super Nintendo Home Nintendo 1990 49.1 million
Nintendo 64 Home Nintendo 1996 32.93 million
Nintendo GameCube Home Nintendo 2001 21.74 million