Currently, I don't see the point of an additional support role. The only real "support" and "utility" tools that matter currently are damage buffs, which pretty much all roles have. I think the game right now doesn't support support roles, if that makes sense. There's nothing to support if the only thing to do is damage.

Like others said, the support role already exists in the form of p.ranged (I think MCH should revert to a more support-focused kit). I'd love to see a rehaul of MP and TP management, where all jobs are able to manage their resources on their own with good gameplay loop, but if things start to hit the fan, then the p.ranged can step in to help out the healers or tanks.