In my mind, the top pick for a 4th ranged job is a Dual Pistol specialist, probably an Aerslaent-based Pirate-type like Musketeer or Corsair.

Though for 7.0, the next full job to come up in rotation would either be Caster DPS (due to every other role being filled in the prior two expansions), or another Melee DPS to share NIN gear (since DPS are 5 melee to 6 ranged at the moment, BLU aside). Personally I think GEO is next most likely Caster (since the alternatives are Time Mage which overlaps AST and like... I dunno, Green Mage? Which isn't exactly super popular), but hey.

Quote Originally Posted by Vencio View Post
Possibly Beast Master?
Unfortunately for this idea, the top bet for Beast Master's unique weapon was Whips... before Bozja established 14's Beast Masters are predominately melee combatants who wield 1H Axes and Shields.

But in all likelihood, BST is tied with Puppetmaster (Mammetmaster?) as the next most likely Limited Job, should they continue on that trend.

Quote Originally Posted by Mezzoforte View Post
Its pretty obvious the next DPS up to bat is going to be a DoT focused caster with them pruning dots.
Alternately it could also mean the exact opposite, that the pruning of DoTs is a step away from having any DoT jobs at all.

My understanding is the devs have previously expressed some disdain for DoTs, since players find them tedious and confusing. After seeing how SMN manages its DoTs, I'm not sure I can blame them.