The Ascian threat is really mute and pointless right now.
Since we killed the most powerful one their story arc lost all the interest.
Fandaniel and Zenos are boring villains.
Also the Empire no longer poses an active threat as it crumbles and falls by its own weight and the chaos Zenos started.
I would like to see more Hydaelyn and Zodiark though. We are far from done with them.
I would also like to see Meracydia and the New World continents.
A subterranean kingdom/ areas with Duskwights is missing from the game.
Duskwights are really left out and forgotten.
They have an opportunity to create a really interesting story with a villain out of our grasp with the "Voice" that corrupted the Ancients.
5.0 raised the bar a lot. I hope the next patch will be as intriguing and interesting as 5.0