No they did the correct thing. The reality just is that pre-2010 the Wii was unique and special but after Kinect and Move came out it really wasn't. Just like Brain Training isn't really special anymore because there's like 20 apps on your phone you can get for free that approximate the same thing. 

Kinect Sports was relatively fun and polished, so was the Sony one, you can't really say "well only Wii Sports was fun". 

I think that had an impact on Wii sales for sure. Why buy two systems if you really don't have to. 

You can't really stop other companies from copying such ideas eventually though and having their own polished product, it's simply a matter of spending money. 

How do you lose a market that rapidly in like 6 months though, because most people admit through 2010 the Wii had a "good library".

2011 even you still have Zelda: Skyward Sword, Just Dance selling like a big ticket ever green, and by that point the system like more than a thousand software titles. 

I really doubt the consumer who buys a console when its 5 years old is really up to speed on the system's month to month release schedule. 

If you didn't have a Wii by 2011, it was more than a good enough value software wise, that means you didn't have Super Mario Galaxy 1 or 2, Smash Bros. Brawl, Mario Kart Wii, Zelda: Twilight Princess (well unless you had the GameCube version which is like 10 regular people minus the collectors), Metroid Prime 3, Donkey Kong Country Returns, Sin & Punishment 2, Wii Sports Resort, Wii Fit Plus, Wii Party, How Much Fucking Wii Can you Wii (kidding), Punch-Out, Red Steel 2, Monster Hunter Tri, GoldenEye 007, ... plus hundreds and hundreds of other games. 

If you're still at that point saying "no, sorry Nintendo I saw your June/July release schedule and I won't buy because of that" ... you really are some strange niche of a consumer. 

The enthusiast gamer who's buying a system in like 2007 maybe looks at stuff like that, but the person in the market for a system in year 5/6/7 is not that person. 

Because good motion control is the logic evolving around some arcade games. Nintendo is the last major arcade producer in the console market. Sega gone, Atari gone. The arcade type game is the Nintendo mastercraft. And aways explode in sales when evolved the arcade type of game. Nintendo master racing arcade (mk) game, fighting arcade games(smash), open-world arcade games (botw), etc. Wii sports and wii fit is arcade games applied with motion control. The motion control response, with Microsoft and sony, is more computer games like visualized motion control and fewer arcade games, that is one the major drawback around Microsoft and sony initiative: their origins is around computer games and not arcade games. Nintendo stop producer big arcade games in 2011, Zelda is the worst Zelda ever and less arcade game ever. Metroid Other M is a cinematograph computer game in a console arcade type. The last medium-big game is Donkey Kong Returns and the last to sells more than 5 million. The switch has better motions controls and betters motion feedback. 

The GBA got token support for a year because even by Nintendo standards cutting it after 3 1/2 years was pushing it.

Nintendo doesn't have some magic button they can push where they can magically make games out of nowhere. The Wii had 5 full years of software support, they had to move on and support 3DS and Wii U, that's just the way it goes. You cannot live in the past. 

The NES did not get all that much support after the SNES launched, tough shit. That's how it goes. The PS2 did not get much support from Sony after the PS3 launched. The SNES got very little support after the N64 launched.  

There's nothing special about the Wii that warranted it being treated any differently. The system was declining hard well before 2012 anyway.  

Companies only have finite resources they can't fixate on declining end of product cycle systems with major games, it's a stupid waste of resources. Yes you can squeeze some extra juice out of the orange, that's not anything magically exclusive to the Wii. You can make Super Mario World on the NES and release it in 1991, it would also be a very stupid thing to do in the big picture. 

Which systems had significant support from their console manufacturers after the release of the successor? Can you point them out? 

Developer support isn't a luxury, it's a very valuable and finite resource, Nintendo in particular does not have freebie resources where they can take care of two newborn game consoles (3DS and Wii U) that need constant early gen support and oh by the way also support the declining Wii too. Why not ask for continued DS support too while we're at it since the DS was far more successful than the Wii. 

This is like asking a parent to look after newborn twins while also having two older children that are so useless they can't do anything for themselves even though they're at an age where they shouldn't need constant attention. The parent is going to collapse from exhaustion. 

I'm sure Iwata could've just pulled all the design teams for all these magical projects out of his ass. Asking any company, even MS or Sony, to simultaneously provide significant support for 3-4 platforms at once is just a flat out stupid thing to ask for. It's not even remotely realistic. 

Lets check your facts then. 

https://en.wikipedia.org/wiki/List_of_Nintendo_products#Nintendo_DS

That lists a whopping 4 Nintendo published games for the DS after February 2011 (Japanese launch of the 3DS). 

Is there missing software?  

So you're basically crying over 4 games. That can be counted on one hand. LOL. 

Like Nintendo had bigger concerns at that point than making sure Rol got a token 4 games for Wii. Tough shit, but there are development realities that you're being naive to. Nintendo didn't have "spare resources" to work on token Wii projects, the 3DS and Wii U launch windows were in dire straights as it was, diverting resources to unnecessary Wii projects would've been about the dumbest thing they could have done at that point. 

Even the 4 games on DS, tiny as that is was probably a stupid idea, they needed every hand on deck for the 3DS and Wii U because they had huge issues getting enough software out for those machines quickly enough. 

6 years is not a "short life cycle" for any system. At worst it's above average. 

3-4 years is where one can cry about a short life cycle. 

The Wii U or Wii 2 or whatever they wanted to designate it as would've failed in 2013 or 2014 or whatever. The brand was stale and every system had the same mini-game motion games, if anything Sony's Move controller was by far the best motion controller any of the three released.

If there was any market juice there, they would've just copied whatever it was, things were never going back to the way they were pre-2010 when Wii was the only real motion gaming platform and you had no choice but to buy it to get that type of experience. 

It's not a blue ocean when every other console manufacturer is doing the same thing. It's not a blue ocean if everyone and their grandma has touch screen games on their smartphone sitting in their pocket at all times. 

I don't think delaying the 3DS and Wii U for a year would've changed anything and you can't redesign a hardware concept in a year's time either. 

So even with 20:20 hindsight, you still think WiiU was the right move. Fair enough.

Also, it isn't just Brain Training that can be done on other ecosystems. Minecraft, PUBG, CoD, Pokemon, FIFA and Fortnite are all on smartphones too.

No I think making any kind of Wii successor was likely going to end in disaster for Nintendo because the uniqueness around the concept has burst and while there was still a sizable chunk of people wanting to play Just Dance ... a lot of people had lost interest in the whole "wave your arms around the TV for 30 minutes".

It gets boring after a while. 

But once you've committed to a hardware design, you can't back out of it or sit there and cry like a baby about it. Once it's greenlit, you have to give it all you got. Even if the headwinds were turning against Nintendo, they had to by 2011 simply suck it up and get to work. 

If anyone could make a Minecraft equivalent that attracted a large audience I'd say why are you on this forum. Make the game and go make a billion dollars. Character/brand driven traditional games like Minecraft, COD, Pokemon, FIFA, etc. can't be copied the same way because there is more depth and nuance to those games and the players are very specific about what they want. 

But a Brain Training game? Some small studio in Hong Kong can crap out 10 Brain Training games with multiplication, word puzzles, etc. and the audience base can be largely satisfied with that. The design level needed to make one is not equivalent to the other.