Expansion is 2015, chances are they won't back trap into Ranged bow class since Bard is currently that.　So next expansion will probably, if we're lucky, be 2016. Maybe by that time we'll go back to clear up any redundant jobs.

For example, new tank/healer in expansion. Then other jobs that need to fill a position, Red Mage, Dark Knight, Blue Mage, etc.　Then after those jobs are filled we can go back and implement things like Thief, and Ranger．　I don't forsee them wasting resources to create the same type of job, in Ranger's case - Bard and Rogue's - Thief, when it could be better used for a new job that hasn't already been done.