More than class overhauls, I'd much rather see more gear customization in Heavensward.
For starters:
- Materia slots in dungeon gear (perhaps only allowing crafted gear to be overmelded)
- Accuracy and Spell/Skillspeed made more worthwhile (ie. accuracy could also give critical hit damage so it's not wasted when you hit the cap, and spell/skillspeed could reduce MP/TP costs at a similar percentage)
- Set armor and bonuses
Also been replaying FF6 of late, and it makes me want a relic equipment slot in FFXIV. They could try and experiment with more interesting effects with relics, such as proc effects, lifeleech, etc., or even create flavor items like "Sprint Shoes" that would increase our out of combat movement speed by double or something.
Jobs could also use more customization options, but I'd be fine if they just open up the # of cross-class abilities. Maybe just get rid of the 2-subclass restriction for each job. Down the road as Square introduces more and more jobs, it's going to be very limiting if the first nine 2.0 jobs are still stuck with the same 2 sub-classes.