This idea sounds like a good start to countering (or at least providing another option) to the "speed run meta" (NIN/DRG/BRD/MCH). One of the issues DRK and casters face is not being the most optimal choice. This would be a nice step in the right direction to removing that gap. Synergy was a big thing for SB when it launched. A lot of changes were made to most classes that allowed them to become more useful in a party. SMN is a good example recently with devotion become a party wide aoe. More of this would be great. Doesn't have to be new skills/spells/etc. Just overhaul 1 or 2 existing ones.