Idea: SE is interested in using nostalgic content for XIV (Crystal Tower) and they have already dipped a toe into FFVI in several ways (Magitek, Ghost Train, Ultima Weapon) so it wouldn't be much of a logical stretch to implement a Kefka's Tower dungeon.
In fact, the game is made for it.
Imagine:
A. In the SNES version, it was a 12 man dungeon, you split your party into 3 groups of four working your way through the "monument of destruction".
B. It has a boatload of amazing bosses and multi-party interactions.
C. It would make heads explode to relive this area as an MMORPG in 3D.
D. It would fit perfectly into the world of Eorzea and mechanics style of FFXIV.
Unnnn make this happen.