Someone mentionned automation systems of FF10/12 and it spawned something in my mind. I wonder if it would work, because that could change the gameplay of support/healer classes. Think of a simple combat system driven by auto-attack(s) (and possibly an auto-heal function for healers) then add an opportunity system layer where different roles gets visual notifications to react to something that happened or that is going to happen.
Exemple:
Warrior auto-attacks, position the spider for the group, then receives a warning that his target is readying a powermove. Warrior trigger his block move and mitigates damage of said powermove, so far, nothing gamebreaking, it's been seen before. Since the tank reacted in time, the powermove was countered and open a backstab opportunity for the rogue, also the move added a poison effect on the tank, healer receives a warning that a party member has been poisonned, his reaction might even determines the final effect of the poison (if not removed before 5 seconds, target is stunned for 10 seconds). Five minutes in the fight, the bard gets a warning that a mana user is running out of mana, he then trigger his mana song.
Basically, use opportunities to notify players that something requires their attention (instead of multiple UI elements) and to engage players in the fight like the rotation of skills was said to do when WoW came in. More engaging combat than EQ is good, but the bloating of skills and UI elements needs to be under control.