Obviously agree with most of the OP, But yet again everyone knows this and many do talk about it (Including Craig)
However as Craig mentioned above there are still many things left over that should be done before focus is pushed to Survival/Dig Deep modes.
With dig deep i believe the blueprint system needs to stay as it is, Its what makes it dig deep, not just realy deep survival, and most first time players love the blueprint mechanic, Its only after a few DD maps it becomes tedius.Blueprint changes
When collecting a blueprint you are offered an option between 3 blueprints
Similar to this.
All three tiers will be of similar reward and type. so if you find a tool BP then you will get a choice between three tools/weapons of the same tier.
What this does it remove the need to get every single blueprint before you find a pickaxe to move on (Which many updates leaves the blueprint for pickaxes out of reach)
Choosing a blueprint will remove the blueprint from the ground and remove the choice from the list so you won't get repeats.Requirements to wield.
Giving players targets helps them stay motivated, But if they are to difficult/long then they become tedious and are then something that are in the way,
So i propose alot of items/Blocks should have small requirements before they can be used
This picture just an example, but id suggest something like 50 clay instead, As many players like to rush till they get to the first hell layer.
Along with thid goal you are required to of find the previous tier blueprint for the tool, so you can't just skip iron to get to the steel tier items. you need to select a path you want to go down and follow it, if not you need to collect more blueprints.Generated Structures
Exploration, we all crave it, we all know the game needs it, However i believe we want alot of it. Dungeons, Castles, Sky Fortresses, underwater temples all filled with rewards,traps and mob specific to that area.End Goal
Everyone wants a goal, Some other biome or some conent that shows you are end game.
Now i think there could be two options. One if fairly obvious.
ever since Craig played with gravity and created the moon seed everyone has wanted to go there on their dig deep world and build there.
moon not you're style?, how about the heavens?
Or why not just revamp the nexus? Instead of having just red stone everywhere and 1 tower made from bedrock, Why not have a battle zone down their with angels/templars vs diablo's and other dark creatures, a constant battle between both sides. Head down the the nexus and you can head inside a portal which allows you to go to the a place in the sky which is made of clouds where demigods/angels roam.
May add more, got tons oif ideas.