It's tough though, we have standards for Zelda games. If you try something new and fail to meet those standards (Skyward Sword's swordplay, TriForce Heroes' fashion esthetic, the Adventure of Link's side-scrolling combat), you take a hit for the five-ten years it took you to develop the game. If you iterate on old standards, you risk people feeling as though the game is too predictable. I think Nintendo has done an admirable job of polishing the Zelda formula to the point where they can hang all sorts of gimmicks, settings, and mechanics on it and still have it feel like Zelda while innovating around that core.