I could easily see a Ranged DPS with a similar theme to RDM.

Red Mage builds up White and Black Mana, then spends that mana on a burst melee combo.

What if they did something similar, but with a Ranged DPS?

Not sure if it would be similar, where they use ranged attacks to build up to a melee burst, or melee attacks to build up to a ranged burst, but the theme would easily fit a Corsair or Cannoneer theme.

Since Limsa Lominsa would be the natural place to pick up that job, it could also tie in somehow with the ROG storyline

That said, I'm not sure if SE would want to dig up old coding nightmares due to similarities with ACN becoming both SMN and SCH.