Bilbo Baggins
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We do not need more structures. We definitely do not need any more dimensions.
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Wither's already hard enough. Have you beat him in a pure survival world? (no creative, no cheats, no save inventory)
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I did it in Java though.
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It's already possible to do that for a single account via Minecraft Forge. I've done it myself.
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It's called the ocean monument.https://minecraft.gamepedia.com/Ocean_monument
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There should be no way out, and every day more and more monsters come until you die. Bring an ender chest so your stuff can get back to the overworld.
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It's called the Nether.
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You are describing a dungeon almost exactly, except for the large size.
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I think they look fine right now.
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I think there is already a form of this. It is called a Jungle Temple.