Ideas for the "Diamond World"

Now I know that everybody knows that I might have maybe accipurposely made a diamond world, where it had a bountiful amount of diamonds. The question is, how do we balance it so that it is a challenge to get said diamonds? Now, my idea is have hydras, liches, withers, enderdragons, and every other mob as a spawner around diamond world around the spawn in a say 2000 block radius. This would ensure that you are battling hordes upon hordes of the world's dadliest blocky monsters. Any other suggestions?