I mentioned this with Black Ops II and there was a fair amount of support so I'm curious if players still feel the same. I understand though that this would be a major feat to accomplish and take up a lot of space.
If each gamemode had one specific map that is only playable for that gamemode. For instance TDM could have a very open concept map like an old west shootout. This might not work with an objective based gamemode because it wouldn't be able to fairly support 3 flag points for DOM.
DOM could have a very linear map where teams push back and forth to control 'B' with few places to flank making the game very head to head. Think of it like two powerful forces clashing in the middle with an epic stalemate ensuing, though not from a lack of trying.
Another option could be slightly adjusting a map based on the gamemode. Headquarters or Hard Point require a team to capture a semi-randomly generated area rather than a very particular point. This gamemode would support maps that might have more accessible buildings. TDM doesn't need this.
I particularly like have maps that change randomly. There's a comfort from knowing a map but at the same time it would be different. When you have a map that stays the same issues arise. As players lean cheap tactics like spawn positions or unforeseen yet overly advantageous vantage points. If the maps were to have an element of predictability I feel this would increase the "honeymoon" phase of the game. It'll have the "new" feel longer.