They can rework ACN (Not ARC) and they might since people had been asking for a long time to separate these two.
They don't need to rework EXP, FATE's ect because healers get credit for healing. The only thing they would need to rework is Hunts and that's not so hard to do.
More like FFXI wouldn't be such a bad idea.
They don't have to rework gears either because Healer already don't have accuracy in their gears 51+. Crit works for healing and so Det for power.
They are already changing how tanks works in the next patch 3.2 so tanks may not even need Str or require little of it.
Healers will always be needed.
