Definitely bring them back..!!
They're much more appealing to me than what we currently have, they're some of my fav jobs.
Although as last post mentioned, i'm sure they'd come out sooner or later, main focus now is to get the game to a decent stage.
The map/terrains/areas, battle system, jobs and abilities, animations. Whole lot to deal with and fix up before introducing new jobs.
I would actually hate to see Sam or Nin come into the game and have crap abilities and effects like current classes. That'd kill the experience.
I hope the new job system completely replaces the armoury class system and we see a new bunch of jobs with fresh new abilities that are actually satisfying, not just a mesh of bucketload of abilities that add little value to a job and mostly feel redundant.