The chances of a third expansion being created are not very high regardless, as the
number of active TW3 players is decreasing, and by the time of the release of a hypothetical third expansion, there might not be enough people still interested in the game to make it more profitable than putting the same resources into developing CP2077. Or perhaps it could be a smaller expansion, or one that uses existing locations (like HoS), rather than adding a major new area to the game.
While I agree about the number of active TW3 players is decreasing, I do not agree if there is a 3rd expansion there may not be enough people still interested in the game. TW3 lost a chunk of players do to performance issues, and I would say that a 1/4 of those people traded in the game and/or sold the game. The other 3/4 kept the game & are on this forum waiting for the issues to be fixed so they can play again. Keep in mind, this is a popular series in the gaming community. I feel that IF a 3rd expansion were made, that the game would still be viable enough to make that 3rd expansion. Also that graph link you put in your post does not include XB1 & PS4 players. That is only PC users
-----------UPDATE-----------
I am currently labeling towns/villages of the in game map, compared to the one supplied by Karol Kowakzyk who consulted with Andrzcj Sapkowski. I am doing this so that way readers can then debate over the places.
---------- Updated at 09:52 PM ----------
As you can see, I placed all the markers in the correct location. So according to the in game world map Dol Blathanna is not able to work. I was mistaken in my first post about Vengerberg not being on the in game world map. With all these markers placed, it opens up a whole slew of locations to visit. So now the focal point of this thread should be restricted to what is confined to the in game world map. That also knocks out Nilfgaard & Zerrikania. The in game world map limits CDPR to what is already in place, which is Skellige Island, Redania, Temeria and a small part of Kovir & Poviss. Also according to the real Witcher World map, there is not a place called White Orchard, It should have been called Carreas. While I can understand that this is only game cannon, and "White Orchard" is something CDPR wanted to put in play, it still should have been called by it's correct name.
I hope I didn't throw everything people voted on out the window, this post was to enlighten the masses. This was a lot of studying & hard work. My legs & back are killing me for sitting at my computer this long, lol