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No.

We will give you a worldguard it, and can expand it when needed.

The main issue why this was first put in place was because we didn't want Worldguards underground everywhere and stopping people being able to mine in caves.

However, if we were to remove this...

Counter potential issue -

In 1.7, we get these nice new biomes. The new desert biome thingy that I've forgot the name of, with the red sand.
It will have canyons - right?

If so, they may go...