Well, I don't think terrain will ever come back in the same way it existed before. (Massive tracts of looping terrain)
But maps, yeah probably. All they ever consisted of were a set of instructions to load various objects into the game, set the sun, skybox, precipitation etc.
I'm actually working on making a map. Using .dts shapes and a little script to load them into the game. It's not very far along. but...
Did you know that Bitch and Blender'sDTloveporter both start with the same letter?