The most important thing in Minecraft is the infinite worlds! This is not possible without the endless depths and heights!
In Minecraft me more interesting to climb and discovering new caves than build.
Please add the infinity height and depth!
I want to infinitely deep caves and mountains! 60. 000. 000 X 60. 000. 000 X 60. 000. 000 blocks!
New underground biomes!
Huge crevices and abysses which can be down using mountaineering equipment (alpenstock, a lot of ropes and nails).
More mobs, subterranean gnomes, trolls, white ghosts who can fly.
Giant underground worms that break through the tunnels (like in a movie 'Tremors' and 'Dune').
You can hunt them to get valuable resources If the worm is close. everything starts shaking.
It is necessary to strengthen the home and chests with things from the loss.
I want the high mountains!
What is this mountains which you can climb for a few seconds. 128 blocks is not a mountain, it is pile of rubbish! ;(
Mount Everest 8850 blocks. Olympus Mons 21200 blocks!
Experience of climbing on them with the help of climbing equipment (no stairs).
Of course the caves inside the mountains and valuable resources at high altitudes.
With earthquakes and volcanoes and lava up in the middle of huge mountains.
I also need to diving equipment.
Deep water with sharks and dangerous octopuses and devil-fish.
At great depth and at high altitude, you can find rare treasures and resources.
In each biome you can find a rare artifact. You can collect the whole collection from different biomes!
With such large distances need to craft teleports.