What else is a corsair going to do? DPS? Don't make me laugh. They have barely, if any, melee prowess, and who would want to waste ammo shooting between weaponskills. Corsair is good for spike damage and buffs, that's about it.

Red Mages are useless, everyone else can do what they can do better, forgoing Refresh II. White Mage can cure better, and spread haste around just as much, Scholar can land buffs to the whole party (besides haste) while the Red Mage sits there casting one at a time. Black Mages and Scholars both nuke better, and finally the only thing left is Paralyze II, Slow II, Gravity and Addle. Whoops, Bards got Addle, and people would rather have some of their unique buffs anyway. Paralyze and Slow will never land on any notorious monster that actually matters, and Gravity is a rare-situation or kiting spell that can be used by, guess what, Scholars with Red Mage subbed..

When Red Mages can have some justifiable reasons to use their swords, enspells, and Temper, then it might step back into the rays of the "useful" light.