Depending on what the job Red Mage gets. I'm waiting to see how that pans out, but my concern stems from the fact that if you're giving part of the magic fencer aspect of Red Mage to the Vagrant weapon class, I'm afraid to see what's left over in terms of design. Considering nukes and cure are covered by CON, enfeebles are in part from THM, and enspells and magic melee (Magic Sword, Spellblade, or however else you want to call it) would be covered by VNT, that kind of leaves Refresh... >.>

Edit: Maybe I misunderstood idea behind the dual system of class/job. Looking over the OP again, is the intention to distribute the main abilities through the weapon classes with the jobs enhancing those abilities depending the role of the job?
I think that SE will use the job system more like a Bonus title system rather then unlocking of skill type of system, but who knows. I like the idea heck I also had a idea for the aoe what if you needed to hit the mob to gain the enspell, but it would only be AOE by Vargard or w/e you call it.