Final Fantasy Dissidia NT event... Why not?

[Enkidoh]

Dissidia NT reboots the Dissidia storyline anyway, given that the original two Disisidia games on the PSP were actually a retroactive pseudo-prequel to FFI despite the appearance of other FF characters (FFI's big villain Chaos was Dissidia's major antagonist, Cid of the Lufaine who was the narrator of Dissidia was (according to the later rereleases of FFI) the original builder of FFI's airship, the world map of Dissidia's world was a ruined lifeless version of FFI's world, and, as WhiteArchmage mentioned above the ending to the original Dissidia dropped off the Warrior of Light directly in front of Corneria Castle, setting up the beginning to the very first FF game).

Having said that, I doubt very much you'll get a FFXIII or FFXI style crossover event with Dissidia here in FFXIV other than a brief event that gives some trivial tie-in reward - specifically, you won't see the likes of Sephiroth or Kefka trooping around Eorzea as a part of it because ages ago Yoshi already stated outright when creating crossover events with other FF games, they will stick to very strict guidelines that outright prevent such a thing from ever occurring:

Also, in regards to future collaborations with other FF series, we will be adhering to the below principles:

· We will never introduce characters that would destroy their meaning or story
· We will not use characters that are already dead or whose role has ended in their title

For example, “Red XIII” who appeared in FFVII.

I believe we mentioned “Red XIV” as a joke before, but Red XIII has a very rare and specific role in the world of FFVII. If he was wandering around the world of Eorzea it would destroy the image of the world of FFVII, so this can’t happen.

This is just a simple example of what we mean.

So basically, that counts out the majority of Dissidia as most have "roles finished in their titles" or "already dead" (majority of the antagonists). So, I'm sorry to say, I doubt very much you will see a FFXIII-style crossover event for Dissidia in FFXIV sadly.