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
To be fair, the Xbone released after gaming had made its way into the mainstream. Those old Nintendo consoles are from an era when gaming was still considered by most to be a child's pursuit, so they had much smaller audiences.
I know, but its still funny that the XBOne sold more than iconic N64 and Gamecube combined. I know this has to be seen in context, that's why I said "just for furn". Also this brings into perspective how insane the PS2 sold, where gaming was in less mainstream position than today. It was Sony with the PS1 and 2 who made gaming mainstream. The PS3 came out 6 years after the 2, while the Switch has a longer period of time without its successor (currently 7, we enter in 8th) and still could not catch up. It's crazy how the PS2 sold.