This is a cheat. I've recently dusted off my lvl61 Bluemage and I remember why physical spells and magically so different. Physical fast casting, TP making, and cheap mp. Magical, expensive MP, multiple effects, slow casting.

If this suggestion would be taken seriously, blue mages would use all physical spells as magical. This would avoid most mobs defensive skills and rely solely on resistances which can be overcome easily with ninjistu and other element down effects. Next, most blue mages would set multi strike physical spells and use with abandonment. Since mobs no longer get 30 or 40 TP per use, a blue can spam them all. No longer would we even bother with dual wield. This suggestion effectively gives bluemages quad-quint-sept-and whatever else attack.