S.Peelman on 18 September 2017
I'm not sure it will, the 3DS is only showing mild signs of slowing down so it could still stick around for a long time. I'd say it'll beat 75m one day, and may even be around long enough for it to approach 80, both of which could be a tall order for Switch. I do probably have to up the 40m prediction I made way back though. 
