This is my list of stuff I think Minecraft should add to the game:
1. They should bring back Herobrine, cause without him, there's no mystery in minecraft. For those of you who think that herobrine is still in minecraft, there isn't even a freaking herobrine texture in the game files!
2. Dialogue for villagers, cause the villages seem kind of boring without there being some speech.
3. More dimensions, like a skylands, a spirit world, or even another planet with alien beings.
4. More random structures, like forts with skeletons guarding them, or haunted houses.
5. Ghost mobs that wander haunted houses.
6. Magic spells to add an RPG feel, spells like acid rain that harms all mobs within a certain area, or fireball, a spell that shoots a fireball like a ghast where ever your looking. Spells could come in scrolls. Ex: A glowing Fireball spell book that casts a fireball, then the scroll is destroyed.
7. Crossbows that fire arrows that do more damage than regular bows.
8. Kinda strange, but there should be vomit, cause it'd be kinda funny to watch your character throw up after eating rotten flesh.

That's all i've got so far, comment and tell me what you think of these ideas!