It's an incredibly cheap move, but who cares? One of the things that I and a lot of other people loved most about OPPvP was the map, it was something about the feel of it and the ability to explore that differentiated it from other servers' similar game-modes. Why don't we just use what clearly works instead of experimenting with new maps? The time for experimentation was two or three years ago, not now when the server is struggling to keep a player-base. I think the entire game mode should be reset (e.g. balances, playervaults etc.), new features added (such as the crystals) but that we should keep the exact same map. I'm fully aware that a Nuketown themed map is currently being built, but honestly I'd say scrap it and just go with what we actually know works.
I do agree a lot of people enjoyed the old map, but I feel it's also important to not have the same old one we've had for so long, the nuke town map aims to kinda be like the old one in the sense of being so flat and such.