Switch numbers are incredible, just like Luigi's game is by the way.
However, i wonder if it's that good in the (very) long run. I am not talking about nintendoom or falling of the cliff here, i don't want to be misunderstood, but when i take into account the followings facts :
-Nintendo best market, especially for handheld consoles ;
- recent hardware revision
-boost only for the lite with a special pokemon edition ;
-luigi's new game this week ;
i'm a little afraid one year of two after the release of pokemon of what the sales can be for the swith. Maybe in 6 months i can see there's no worry to have, when we will have analysed the effects of pokemon and christmas on the market, and the few monthes of sales after this.
There is nothing to worry about, by this point in time 3DS was already starting to fade while Switch seems to be hitting its stride.
3DS having a price cut in year 1 and revision in year 2 while Switch didnt get those until year 3 is why they are having different trajectories.
Switch could very well start to decline in year 4 but it should be a much smaller drop than 3DS had and it should start gaining ground from this point onward.