I've been curious about this and this seems as good a place to ask as any,
Since Switch is effectively Nintendos home and handheld now, and I think combined WiiU and 3DS were around 70 million units or close to that, isn't it kind of a bad thing if the Switch doesn't reach that number? I understand the excitement of it selling better than the WiiU, but it would think it would have to sell more than 3DS and WiiU combined to not still be considered a drop off. I have a hard time thinking it's going to reach that number.
It's a bit early to say that it won't reach that number it could very well be around half way to 70 million at the end of 2018 if Pokemon releases.
There is a major price difference between Switch and 3DS:
Price: $300 vs $170 at this point.
Peripherals & Accessories: Additional money is generated by things like the ProController, additional JoyCons, Carrying Cases, Grips etc which 3DS did not have.
Game prices: They differ greatly compared to 3DS and Switch. Despite difference in price Switch software is selling at a rate that is much higher than 3DS software launch aligned.
Digital Storefront: Snipperclips, Minecraft have sold well beyond 1 million combined, add to that the huge number of indie success stories, expansion pack for the Switch's biggest game(BotW) and a rising digital adoption rate for 1st party titles compared to past platforms. You have a vibrant new storefront that is likely to already be more successful than either 3DS or Wii U's digital storefronts.
Subs: Nintendo will start charging for online next year which would be another revenue stream both the 3DS or Wii U lacked.
Overall Switch is likely much more profitable then either:
3DS - needed a price cut very early on in it's life to sell
Wii U - expensive to make and not popular
In any case I wouldn't be surprised for Switch to easily pass 70 million by the end of it's life, we are talking multiple revisions, multiple devices per household, pricecuts and games like AC, Pokemon, Smash etc