It's this simple: a cartoon Zelda U would only appeal to their established audience.
A darker semi-realistic Zelda U would capture thousands of gamers who would otherwise never touch Wii U.
The Wii U needs all the help it can get. Making its main Zelda a toon one would be a monumentally stupid business decision. Then again, they're been making a lot of those lately, so it wouldn't surprise me.
If there is an ounce of intelligence left in Nintendo's management, Zelda U will look Twilight Princess esque.








