One thing I haven't seen mentioned is how well Nintendo's other handhelds have performed. Here is a brief rundown of each of Nintendo's handhelds by global sales
|Game Boy||118.69 M|
|Game Boy Advance||81.51 M|
|Nintendo 3DS||75.45 M|
|Average Sales||107.41 M|
Keep in mind too that the GBA was cut off early so it was only on the market for about 4-5 years. But as you can see, the average for Nintendo's handhelds is 107 million. This is already about where the PS4 is at. Switch only needs to sell a bit more above the average which is very doable. Nintendo's Q3 results aren't out yet but so far Switch sales are up about 30 percent through the first 6 months.
I think this assumption that it can't happen is really driven by people looking at the console side and not the handheld side. There is a reason Nintendo made a hybrid system.
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Known as Smashchu in a former life