No. It's true of the tiny Vgchartz audience. And Nintendo doesn't need to anything but make good games the way they want, not the way a few angsty teenage boys with kneejerk needs for blood, gore, grey and brown want. You want a gray action game with a sword? Go replay Twilight Princess, or better yet, got buy the other two boxes.

And Twilight Princess sold so well because it was released across two platforms, and was released in the beginning of the life of the greatest selling home Nintendo home console of all time. Not because it was "realistic." Every Zelda released at the end of it's console cycle sells less. Majora's Mask sold less on the N64 than OoT. Twilight Princess sold less than Wind Waker with a wopping 1.59 million on the GCN. Skyward Sword sold less on the Wii than Twilight Princess by selling have of TP's Wii total numbers at the tail end of the systems last relevant year.

Wind Waker HD, the brightest and most cartoony Zelda to date, has almost hit almost a million units in almost less than six months on a console with only a 5.5 million install base if you don't count digital sales which it has topped just about every week since it came out, even in the wake of Super Mario 3D World. That shows that the general audience doesn't care about gritty adult Zeldas. They just want a game that will play and look good.

And again, Aonuma already confirmed that Zelda Wii U wouldn't look like the tech demo, so why is this still being discussed?

Actually, it's true of the mainstream audience. They don't necessarily want "blood and gore and grey and brown", they just want an epic fantasy that doesn't look like an episode of the Powerpuff Girls.

A toon Zelda will only appeal to children and people who are already committed fans. A Zelda in the vein of the tech demo would bring in gamers who would otherwise never touch the Wii U.

No it wouldn't have. GCN had Resident Evil 4, Metroid Prime, Metal Gear Solid: The Twin Snakes, and Prince of Persia: The Sands of Time. If those "dark and gritty games" couldn't help, Zelda wouldn't have either. And let's not forget that Wind Waker was the 4th best selling game on the system, behind only Mario Kart, Super Smash Bros, and 3D Mario. The minority of anal gamers have mighty loud voices, but the sales beg to differ.

And guess what? Wind Waker HD was now met with great praise and enthusiasm. What's that say about gamers now?

The sales show Twlight Princess is far more desirable than WW's approach.

And a remake of TP using the tech demo graphics would have sold over double what WW HD has by now.

You say these things, but what evidence do you have? Outrage from people who thought the game would look like the demo? That's not quantifiable. What is, then? Well, Wind Waker is the 4th best-selling game on GameCube (only surpassed by larger Nintendo franchises), and it recieved an immese amount of acclaim upon release. 96/100 on Metacritic, equal to the GC version of Twilight Princess. That level of praise is typically reserved for games with large mainsteam and hardcore appeal. And once the 4.6 million sales are put into the context of install base, I don't see how the game can be considered a failure, or widely shunned, even if you personally feel as if Nintendo should have changed certain aspects of the game in order for it to be more successful.

My argument is both straightforward and backed by numbers. The Wii was far more successful than the GameCube. Twilight Princess was released on both systems. It had a massive advantage and there's no room for dispute.

GCN's "kiddy" image is well known as one of the system's biggest stumbling blocks. And Wind Waker was a big contributer to this image. What message does it send gamers looking for a next gen successor to Ocarina of Time when in addition to the system looking like a fisher price toy, its flagship Zelda looks like an children's cartoon? 

Define better graphics.  If by better you mean more technically impressive, then maybe. If by better you mean artistically more impressive, then I hope so. I always thought the tech demo was hideous and I hope that Nintendo goes with a more interesting art style. I just couldn't stand how that tech demo looked.

That argument always felt off to me. In fact, it seems less like an argument and more like a talking point repeatedly brought up by Xbox fans circa 2004. A "kiddy" image didn't stop game/hardware sales in the past. Heck, the handheld market is still driven by cartoonish-looking games like Pokemon. The mobile market has Angry Birds. Cartoon-ish graphics do appeal to the mainstream gamer. Realistic art design still clearly has its place, but inheriently not to the detriment of other styles.

From what I see, what matters more is accesibility, and on that front, the Wii obliterated the GameCube and became far more successful.

Empty words. There is literally no agreeable proof to back that up. Like someone else said, 120 million installed base vs 20 million. And even then, Wind Waker was the 4th best selling game on GCN. Twilight Princess was 17th on the Wii.

I'm not saying it was the GCN's only commercial drawback, just that it was a major one, as it really hampered Nintendo's attempts to capture the crowd who were into GTA, Halo, etc.

The 6th gen console market was quite a bit different to the portable market, the mobile market, or the post-Wii console market.