Eorzea isn't even a continent. It's a region of the Aldenard continent, which also includes Sharlayan, Garlemald, and Doma, as I recall. Those places would be rife for opening up before a new content is introduced.
No, Eorsea is the Aldenard continent + the isle of La Noscea. Garlemand and Doma has nothing to do with Eorzea, they arent even on the Aldenard continent