Personally, I agree with mark3942 and half of the people posting on this thread. The Nether needs an opposite; after all, Minecraft isn't supposed to be a dark game. But the Aether mod feels like a whole different game. I like their concepts of having Aether versions of everything in the Overworld, i.e. Aether soil and rock, and pigs with wings. But the boss mobs, powerful items, and tons of new blocks aren't that fitting; after all, the Nether only has 4 types of blocks: gravel, soul sand, netherrack, and Nether Brick items. I would like the dungeons (without the bosses) to be revived as Nether Fortress-type strongholds. TL;DR I like the aether mod, but would only like parts of it revived in a vanilla version.
TL;DR I like the aether mod, but would only like parts of it revived in a vanilla version.