This is the crux of the issue for me. I've played two of these jobs for six years, and one for five. I find the existing DPS roles to be incredibly boring (3.0 BRD was my absolute favorite, but the direction they went in 4.0 ruined it for me; all I wanted was more songs for the priority-based bowmage), and while I like tanking, none of the current three really 'fit' my style or character considering they're all of the tin can variety, PLD being the most tolerable 'cause of the spell casting.
Healing and support are my favorite roles. Since the latter doesn't exist in this game (and no, ranged DPS doesn't count), that leaves only one option. The one option that's been criminally ignored despite being the most important piece of any party comp.
It's hard to feel inspired going into the next expansion when the only thing keeping you here is the story (which could turn south at any patch number; some of the 4.1-4.56 plotting choices were... questionable) and your character.