Just in case you guys are unaware, the ending for 3.0 has already been planned, as has the premise of 4.0. In some of the live letters, Yoshi has spoken of it but no details were given, obviously. Only that the entire story for 3.0 is written and set, and they are already working, even if only a little, on 4.0's story. I don't see them changing that.. But like it has already been stated, there are other city states we have yet to venture to on this continent. Ala Mihgo, in the land of Gvr Abania, being one of them.For those unfamiliar with lore, there is also another port city north of Limsa Lominsa on the other side of the U'ghamaro Mines. And another completely secret city beneath the Churning Mists called Sharlavan. There is also a VERY vast region, north east from Gridania, easily the size of all of Abalathia and Dravania combined called The Garlean Empire, which we have heard very much about. There is also another region north of Gridania called Xelphatol, which I believe has been mentioned, even if only briefly.

My point is, they have a massive amount of content planned so its not something you should worry about much