Straight from their financial briefing:

https://www.nintendo.co.jp/ir/pdf/2017/170428_2e.pdf

It is clear to see that purchases are primarily made by male consumers in their 20s and early 30s.

This is the audience Nintendo should focus on for Switch for a while IMO, it will be what drives market adoption most aggressively. This is also why nostalgia IP like Bomberman and Street Fighter can do well on Switch, a lot of this demographic grew up with said IP. 

3DS/2DS is good for kids, there's hundreds of games (thousands including if they want to ever offer their DS catalog via eShop too) for it and it's dirt cheap. No problem is keeping that around for another year or two. 

Mobile is good for whatever is left of the casual crowd, they don't want to play home consoles anymore and like their free games with simple no button controls. 

Those three pillars are working well for Nintendo right now, keep it as is and keep pushing it. 

Yep. More BOTW and less 1 2 Switch.

Yeah Mario Odyessy needs to really be a big title and so does Xenoblade 2. They may want to think about the scope of that Zelda DLC too. Maybe make it meatier. 

I was just speaking to my Dutch cousin who's in town visiting (I think he's like 24 or something) and he was super excited to see I had the Switch, but after talking learned he STILL had never heard that the "Wii U" was a thing after the Wii.

I can also say I've actually encountered a number of people around my age in 20's in 30's who bought it specifically for Zelda and really liked the console itself, whereas I virtually never met anyone that had a Wii U outside of the most committed "gamer" friends.

The personal experience of one person can't be said to represent everyone for sure, but in just under two months I've seen more enthusiasm and awareness of the Switch than I did over the past half decade for the Wii U.

If I had to guess, that's more Zelda's (or at least, this Zelda's) general demographics than anything involving the Switch.

This is true of every system in the release window. In fact, it is basically true of every new piece of tech.

So hopefully Nintendo will create games that focuses on this age group :p

It's also a product of marketing. Look at Nintendo's marketing for Switch:

Also look at where Nintendo is marketing -- the NFL Superbowl, college basketball Final Four, before R-rated movies like Logan, getting someone like John Cena, etc. etc. etc. All this paid off big time for Nintendo. 

It makes a big difference when you don't market your product like a child's toy. 

It doesn't mean neccessarily they need suddenly to make hyperviolent games, but Zelda, Mario Kart, Mario Odyessy, Bomberman, and IPs like Contra, Street Fighter, NBA, NHL, NFL, Megaman, Xenoblade, Fire Emblem, Monster Hunter, Splatoon, Final Fantasy, Dragon Quest could definitely have success on this platorm with this demographic. Though hey, even though I personally don't like the series, Take 2 may want to think about a GTAV port for Switch, it would probably sell ok. 

Hush!, there is profoundly insightful analysis going on...