I feel The Wind Waker actually relied on the toon-shading for its gameplay, in a way. Like, the wind was such a huge concept to the game, and changing its direction is insanely important for the sailing. If the graphics had been realistic, the wind would not be visible. Thanks to the art style, you could see the wind as little streaks of white. Made a huge difference.
Now, I would totally be behind another toon-shaded game, but only if it actually benefits the game like it did for The Wind Waker. I loved how soft the edges, how vivid the colors, and how separate the values were in such a style. While Phantom Hourglass and Spirit Tracks attempted to hold up that legacy, the edges were insanely sharp, and there several more values seen--look at how many different shades there were on the characters compared to the way they were in The Wind Waker. If The Wind Waker was, say, 85% cel-shaded (give or take, since some surfaces like the ground was not quite such), then its sequels were only 60% cel-shaded.
If we were to get another game with legitimate toon-shading, my artistic mind might be satisfied, because I like knowing that Nintendo is exploring that aspect of the games. So, sure, I'll take another cel-shaded game. But, then I would also like to see another sprited game. And another realistic game. And any other art/graphic style that they have used or have yet to use. Experiments!