It's looking like the ultimate end goal for the job design team is to design only 5 distinct jobs (Tank[WAR]/Healer[WHM]/Melee[RPR]/Ranged[MCH]/Caster[SMN]) and make every job within the role different skins of that one design.
Jokes aside, with how they've been lately, that may actually be their end goal. It would be extremely easy to balance if they only had to balance for one playstyle in each role. Engagement for each job would also go up a lot since every job in a role is exactly the same and people just pick what skin they want. I guess we'll know for sure when we see the DRG rework and whether or not it's a RPR clone.