Again you doing that..

Nintendo said they were experimenting with various art styles when they were chosen art style for Zelda U, and they certainly chosen art style that looks and fits best for new Zelda and Wii U, they didnt said "realistic graphic is mainstream let's go for mainstream", no, they said lets find art style that looks and fits best for new Zelda, and thats a good thing not bad thing. 

They probably experimented with more darker art style too, but didn't look good like Zelda U art style or Wii U hardware couldn't handle it.

I am aware they tried it, I just don't think they made the right decision by not pursuing it. I think Aonuma lets his own graphical preferences override his business judgement. He makes the games he wants to make instead of what the market wants.

Thats point, they dont pursuit anything, they just want to make great and beautiful Zelda game, they will choose art style that fits best for any Zelda game that is in development in that point.

And I already wrote you about market, they listening what their fans telling them they want, not market that doesn't love Zelda at all.

so what? you needed a Gamecube to play Wind Waker and an N64 to play OOT. Its all just HW, hell if anything it should matter even less in SS case since its a add on/controller vs having to have a completly different system. And if one is a fan of Zelda would a ten dollar add on to a controller really deter one from getting the game? kind of doubt it.

I dont think install base is as big a factor as some make out. If people REALLY want a game they are going to get it no matter what.

Of Course you need GCSE to play WW, but if you want to play SS you need Wii and addon for controller or different type of controller, not exactly same thing. Motionplus was $20 not $10, and Remote Plus was $50, but I am pretty sure that almost every real Zelda fan regardless that, paid that extra cash in order to play Zelda, but there were also so many people who had Wii and they are not big Zelda fans but they wanted to play SS also, but they didn't wanted to give money for game and addon/controller that is required for that game.

Install base is definitely one of the biger factors when we talking about sales of software, that is a fact. Reality is that buyers of games are not only people who really want that some specific game, some people will buy game because commercial or hype about that game, some will buy game like present for someone else...and definitely lot a of those people didnt buy SS when they realised they need to pay extra cash if they want to use that game. So yes, definitely SS sales numbers would be higher if game doesn't required Wii Remote Plus or Motion Plus. Also Wii was very dead at end of 2011. when SS finally arrived.

Appealing only to the fans who will buy it anyway is foolish though, that only limits your potential audience. There are enough Zelda fans to support Wind Waker/Skyward Sword levels of sales. To reach Twilight Princess levels, you need to reach beyond just the established fanbase.

You do realize most of Sony's games sell like shit compared to Nintendo's games right?

No, foolish is to make something that people actually buy your product dont want, that would be really foolish. Also Zelda U art style is far more appealing than WW/SS and almost everybody like it, reception about art style and graphics Zelda U were great.

Again, didn't had that sales because of art style and more dark look.

Hardcore fans will buy it regardless of its art style. But mainstream gamers prefer "serious" graphics to cartoon graphics, as you have already admitted and as the weekly sales charts prove. Appealing only to a fanbase that can support 4-5 million sales is foolish when you can reach wider and sell better.

Your problem is that you are only thinking of what you want, rather than  what the market wants, which is Nintendo's problem also.

Unfortunately, as long as Aonuma is in charge, the problem will exist. He knows about the art style, he changed TWW2 for Twilight Princess because people asked for that art style, he already knew at that time which one will sell better. Yet, even knowing all of this, he keeps obssesed with his cartoons Zeldas.