Certainly they will have to change many things to make it work. Main among them, the interface and the need for addons. I wish that they do not were necessary.
For the first time I am playing beyond FFXIV's ARR base storyline and, well, I am having so much fun with the raids, with random people and with a looking for group queue system! And people do not leave the group after the first wipe. Such a different experience that I wish WoW devs encouraged.