This has been suggested before, mainly in the suggestion for a cave overhaul. Please search before creating entirely new threads, since I know for a fact that there are at least 4 threads with this idea in them (my own included).
That said, this IS a good idea. While caves are pretty awesome with the abandoned mines and all, they could use some more development. And since it looks like Jeb is thinking about increasing map height, caves would have more room to actually occupy.
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Teacher, gamer, and writer.
Creator of "The Wizard Gandy" Minecraft map series.