Because Sony is destroying the market and MS doesn't really have the IPs for it (aside from Halo, Gears and Forza)

Huh? What are you disagreeing with?

Well by that logic then nobody should ever give advice again. 

You do realise that "sells a lot" isn't actually the same as "successful", right?

Wait, you probably don't, so I'd better explain it to you like you're a child. You see it's successful if it makes money. Nintendo is currently making money. It will be making more money in the near future. And before you mention recent losses (before the most recent few months), I'll point out that despite the PS4 selling a lot, Sony's game division lost $78 million last financial year. And Microsoft appears to be losing money on the Xbox One (although it's harder to determine with confidence, due to the structure of the company).

Simply put, if you don't comprehend that sales are different from success for a business, then you might want to study up on elementary business principles.

Moderated - Leadified

Reasons Nintendo shouldn't go third party:

1. Sega's third party decline.

2. Third parties often struggle and go through hard times. People make a fuss when Nintendo goes in the red but financially they've been very stable compared to the third party competition. Nintendo are where they are because of their business model. They shouldn't throw it all away and become one of the crowd on a knee jerk reaction.

3. As part of the crowd they'd have to compete with the competition in terms of marketing. Nintendo spends a fraction on marketing for their games as big third parties do. Suddenly the cost of making a game will dramatically increase when factoring the increased cost of promotion.

4. Love them or hate them Nintendo hardware pushes in a different direction and that variety enriches the gaming landscape.

5. Nintendo consoles and the overall tone of the games appeal to a different kind of audience than the competition. Yes, you can get family friendly games of a Playstation but even with Nintendo's third party support it's not the systems focus. You risk losing an audience that might otherwise not get into non-smartphone/tablet gaming.

6. I'd be a PC only gamer. Nintendo is the only company that offers enough contrast to make me want a console.

Their games wouldn't sell any better than they do now.

People choose to ignore Nintendo in favor of other publisher's games for their own reasons. Even if a Nintendo game were available to them, they wouldn't care to buy it for their PS4 or X1

last week the sold more than 600,000 units of hardware.

Why not go 3rd party in terms of handhelds? make games for the 3ds it's clearly the place to put their handheld games for profits? Why not just both agree that 1 system is better and just make games for that? why have people compete between ps4 or X1 just shake hands and then everyone wins right? Give me one good reason why they don't as a person who buys games I don't see why the world shouldn't be a way that would make it easier for me to buy all the games on 1 system since I matter so much!!

Is XB1 pulling a profit?  Has the XBox Division been profitable overall for Microsoft? 

What is success?

If Nintendo drops the Wii U to $10 and it sells 50million consoles next year but loses huge amounts of money, will that make them a success?

^This, once gamers get a taste for well made games they won't want to come back.