FFXIV will never have a full on support job. It's basically just Healers, DD's, and Tanks. The way the entire game is set up it defied the usefulness of a pure support class. I guess if you'd be happy with another DD who can cast a couple of weak RDM spells that's the best you're going to get.

There's never going to be any dynamic jobs because this game is all about being as simplistic as possible. It'll just be one of the usual 3 roles with a different name.