3.4 is also going to be adding new GC ranks to the game so I hope there is some main story for that to since ishgard is more or less fine. As far as the other main story stuff goes, I have a feeling it will be us and the scions teaming with Alisaie and going after the Warriors of Darkness and the Ascians once again. It's my hypothesis that Alisaie will tell us what she learned, we'll go investigate a lead, and it will ramp up from there.