If this ever happens, I have a feeling it'd be something like Onion Knight, so they could do minimum effort and import a lot of traits, spells, equipment, and even job abilities from other jobs.
Besides Onion Knight, what FF jobs are left untapped so far in FFXI?
Mime: just can't see it happening.
Green Mage: they enhance and enfeeble, and all of that is covered already.
Gambler: incorporated into Corsair.
Spellblade/Mystic Knight: incorporated into Red Mage.
Berserker: could maybe make this into something, but it would be difficult to make it very distinct from Warrior.
Geomancer: they can make this into something, but balance would be difficult because its abilities are tied to the area you're in.
Viking: they could make this into something.
Other jobs, like Hunter, Sniper, Assassin, Animist, Gladiator, Cannoneer, aren't very different from what we have already.
