Why is the topic of going 3rd party always limited to just Nintendo?

Why doesnt anybody ever suggest Sony or Microsoft should start putting their games on every platform available?

Imagine how well Uncharted 4 or Halo 5 would have sold on PS3/PS4/360/XB1/Windows/Steam.

Probably because those platforms sell generally better than Nintendo consoles and are widely supported by the third party community, whereas Wii U is a like a house party where only 2 people showed up. 

Though hey, maybe Microsoft should consider going second party to Nintendo and let them helm the Scorpio project and just do the back end stuff (OS Windows stuff, XBox Live, etc.). 

OF COURSE. I would really love to hear a person who said no reasoning behind it.

But Nintendo makes more money then they do in their gaming divisions. They did last gen, and they did the generation before that. It's only until recently that this has changed. You can chalk that up to handhelds, but the fact remains, so that excuse doesn't hold up at all.

People need to stop confusing revenue with profit. 

Nintendo makes $20-$30 profit for one $50-$60 game, that's probably more than a $300 console, the hardware will inflate the revenue numbers because it's so much more expensive (one system can be the cost of 3-4 games), but games make the majority of the profit. 

Sure, and Windows should launch full Linux support! No, wait, it should go opensource!

Come on guys, this fanboys' wish for Nintendo to pack up and leave are childish and laughable.
Nintendo won the Handheld market and while WiiU is selling -relatively- bad, it has still sold ~62% of XBoxOne numbers. And as far as exclusivity goes, Nintendo still holds the biggest number of them - 258 according to Wikipedia, compare it to XBox's 30 and PS4's 106. Over 120 games have >7.5 score on Metacritic, so it does have games.

Tl;dr This is shill. Also NX will rule.

I don't see what any of that has to do with my post. I didn't confuse revenue with profit.

How about put a subscription nintendo virtual console on other consoles?
So, nintendo goes with a tradictional console. They have their own hardware, and make games exclusivly for their console, with free online.
But put a virtual console on any other device: in other consoles, you have to pay to have access to the virtual nintendo console, and it would map the controller to the nintendo controler and emulate nintendo games from the virtual console and play online. And yes, youll have to pay for the games and the subscription for the nintendo virtual console.

For those who choose to buy the nintendo console, they dont have to pay the subscription, pay only the games, and free online.
For those who dont want to buy the nintendo console, but still want to play nintendo games, just pay the subscription, and pay the games they want to play while the subscription is on.

-For nintendo console owners, not would change(maybe more people on online?)
-For other console or pc owners, would be better because they would have access to nintendo library on their console, and do not have to buy other console
-For nintendo is awesome, bring games to more people, sell more games(mainly digital, which profit more), earn money of subscripton(kinda of money they woud loose to not selling the console for everyone, i though a 50$ per year subsciption(could be less), in 5 years would make a 250$, kinda the price of a nintendo console, but with no manufacturing costs)

Better for everyone.

Wii U is failing in every way and basically without any 3rd party, NX will definitely have stronger 3rd party support.

Regardless 3DS 3rd party, Monster Hunter says hi. :)

Iam pretty sure Nintendo making more than $20-30 of profit for every sold unit of hardware, also you realise that Nintendo selling tons for addons for their hardware and they have huge profit margin for them, for instance Nintendo sold minimum 100m Wii Remotes with price of $50, and cost price of Wii Remote was $10-15, do the math.

$20-$30 take home is pretty standard actually for the hardware itself probably a bit generous for consoles to be honest. The Wii was a massive outlier (outdated hardware that Nintendo could mark up massively thanks to a controller gimmick), Wii U is more of a standard take home. 

Yamauchi himself often used to famously say the hardware is just something that's basically in the way, they want to sell games because that's where they make money. 

The success of Pokemon Go is a game changer though, if the plan was to kinda just make a few Nintendo apps that are just kinda small time side-story type things, I think that's been blown out of the water. They now have to take mobile very seriously and it may well be their no.1 profit driver in the future. 

Dedicated handhelds are declining (because that audience has been eroded away by mobile) and the console market has changed so much that Nintendo's style of console doesn't really fit where that market is today (violent shooting games with realistic graphics and sports sims dominate the market).