The reminiscences of Seanchan who have formally been before it strongly suggest it employs something similar (perhaps identical) to Compulsion, which would certainly explain the mindless adoration so many Seanchan, even at the highest levels, direct toward the Empress. If it is something like that, it is hard to imagine the Seanchan carrying their Empress' throne to the Oathbreakers land (if it is even practical,) so rather than just a trip to Ebou Dar, that might merely be the departure point for a transatlant—er, transARYTH trip. I do not think this is one of those prophecies that can be fulfilled with the kind of casual dismissal that facing the Amyrlin and knowing her wrath was (assuming that one has actually been fulfilled.)