Sharlayan could still fit as the big city, though it takes more stretching. In Stormblood, we went to Rhalgr's Fist first then to Kugane very early on, and then had to return to Rhalgr's. In this case, however, we'd go to Thavnair early on, cut through an entire continent, cross the sea to Sharlayan, then do the same thing the other way around towards the Empire.
It COULD be done, and I still want to see Sharlayan. Guess we'll find out in May.