Yes and no. Yes you can have new zones while updating older ones. However I disagree with staying in the same place can only lead you so far. There could be new quests added with interconnectivity that could lead to a whole myriad of new adventures within old zones by adding in different encounters, etc.
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See to me WoW was always this high fantasy type world. Guns existing in high fantasy worlds is fine with me so long as it doesn't devolve too much into a steampunk heavy world. Not that anything is wrong with that in a different type of game. But when I think of Pirates I always associate them with flintlocks, and cannons, etc. Dwarven Hunters wielding muskets aren't a bad fantasy either. It just comes down to what your thing is. WoW's magic is that it allowed you to play whatever fantasy you pictured for your own character.
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Yeah I more or less agree with your post myself. As mentioned for me WoW was always about creating your own fantasy. People dying in a fantasy world and coming back is old news. I don't know what this guy is on about. Also creating and playing a Dragon-esq character is actually a cool idea to me and I'm sure to many others, just as I'm sure it's not for everyone. But playing the game how you like and making the different characters and fantasy tropes your own has always been one of WoW's biggest draws.