An enormous chunk of the playerbase would sooner cancel their FF14 subscription and slit their wrists than ever set foot in Bozja, after how Diadem and Eureka went.
I'd find it a baffling decision on SE's part to continue the Bozja story at all, let alone make it *required* for anything in the future. Including just understanding the MSQ.
If anything at all eventually comes of this storyline, I'd expect it to be summarized for us in-game; I'm personally expecting us to never hear about the IVth or Dalmasca again.