Now will be a good time to release Wii Sport !! It's this year or never !

Former gamers.

Former gamers are the people behind Wii and Ds sucess. 

There's no doubt that Nintendo wanted a blue ocean product, but thats been the case since the DS. Whether they actually achieve it is another thing. Unless I'm mistaken Switches launch year was heavily driven by their core fanbase and it also skewed more older than traditional userbases, so the degree of outreach beyon traditional demographics wasn't clear in 2017 like the way it was in 2008.

It was more subtle but it was there.
Familiar hardware. TV remote (Wii) v Tablet (Switch)
The return of the wiimote/nunchuk.
Built-in local multiplayer
Return of wheel + casual friendly auto steer/accelerate options in MK8D.
Wii Boxing 2 (ARMS).
Controller demo, minigame compilation (12Switch).

Switch makes the Wii look like a prototype. The main difference is price. Switch isn't the bargain Wii was if you don't value portability.

IMHO there is a push for more simple games. Indie games, Pokémon s/s, animal crossing, etc. I know my kids aren't into huge open world complex games. I expect this trend to accelerate.

But, how can that be true? EA specifically said they don't have to release games like Madden NFL on the Switch, because every Switch owner already has an XBox or PlayStation to buy it on.

Wii Fit U
Wii Sports Online
NintendoLand
Launching with NSMBU 
Multiplayer Focused 3D Mario 

The early efforts for the Wii U seem more notable than Switch early in its lifetime

.... The latter section was just userbase data, I thought it gave the impression of Nintendo's Switch initial audience being unsually "hardcore". 

"Nearly two years from launch, the demographics of Nintendo Switch owners are beginning to fall more into line with the demographics of other Nintendo system owners, with marked differences from owners of other consoles."

https://www.gamesindustry.biz/articles/2019-02-11-eedar-nintendo-switch-attracting-more-women-wider-age-ranges-over-time#:~:text=Early%20adopters%20of%20the%20system,male%2C%20and%2030%25%20female.&text=The%20PS4%20and%20Xbox%20One's,and%2053%25%20female%2C%20respectively.

But the point was to question whether it was actually clear that Nintendo was succeeding with its blue ocean strategy back in 2017 because the initial audience was distinctly male and mostly yuppies

The problem with the games you listed is that Nintendo's focus with the Wii U (and 3DS) clearly wasn't a blue ocean strategy, despite these titles being on the system. Games like Wii Fit U, Mario Bros. U and Nintendoland were by the numbers, soul-less titles, unlike the games on Wii and DS. Also, the hardware of the Wii U and 3DS clearly didn't attract mass market customers. So even if Nintendo wanted to attract a blue ocean audience, it failed to do so with Wii U and 3DS. The Wii U was the polar opposite of the Wii.

As for your second post: I think the point here is that it was always obvious that Nintendo needed a blue ocean strategy to make the Switch a big success. I remember having these discussions years ago with certain users who always claimed Nintendo would only need to attract male gamers aged 20-40 to make the Switch wildly successful - which was obviously wrong and Nintendo always knew they wouldn't have massive success without attracting a wide audience. After all, that's what they've been doing in the handheld sector since the 1980s and the only time their handheld failed to perform to expectations (3DS) was when they didn't attract that audience in large enough numbers. So yes, it was always clear (to Nintendo and observers like Rol) that the Switch would be a blue ocean product, even if the audience consisted mostly of hardcore Nintendo fans right after launch (after all, that's going to be the case for any established console or consumer product: The most enthusiastic "core" fans of your product will buy it first).

Technically true for me, although I mainly play on PC lol that's how it's always been for me. My PC and whatever is the latest Nintendo console

So it's similar in that way to the Wii and DS right? The Wii and DS combined sold about 255 million, and a large percentage of owners of those devices had no other home or handheld consoles in their possession.