Soundwave on 08 November 2016
The more realistic agregate for the Switch is 3DS sales.
The 3DS sold an average of 12 million/year, but a big chunk of that came before cheapo tablets flooded the market and really damaged the 3DS market the last 2-3 years IMO.
So I think a year average of 10-11 million would be ... ok. A small decrease on the 3DS.
