The peanut butter and jelly sandwich has not changed much over the years. Connoisseurs have added gourmet peanut butter or fancy jelly (passion fruit jelly anyone?), but its purpose has remained the same. Take three ingredients, and combine them into an inexpensive and delicious sandwich.
The Legend of Zelda is the PB&J of the video game world. The consoles are fancier and tweaks have been made, but the core idea has seen little to no innovation since the jump into the 3D realm. Even the first DS title, Phantom Hourglass, fell prey to the series' excessive dedication to formula. One would think that the growing concern for the series' longevity would generate some form of creativity.