We'll likely stop Nidhogg but I suspect that something will happen to ensure that we don't get anything more than a bittersweet to the storyline. The expansion was, after all, marketed as being 'darker' than ARR. I imagine that the wedge between Ishgard's 'haves' and 'have nots' will persist as well. The High Houses are unlikely to throw away their position. I imagine it's the same for many of the minor nobles as well. Besides, now that they're part of the Eorzean Alliance, why would they? The other nations have exceptionally wealthy individuals too and they're not about to give up their power and status. Nor should they, as far as I'm concerned.