https://www.reddit.com/r/ffxiv/comme...swered_an_ign/
It's been said that ARR was designed with a 2/2/2/2 role requirement in mind (2 Tanks/2 DPS/2 Healers/2 Hybrid). There's more places to find information on the specific interview, but basically it was an answer in reply to why we have an 8 person setup for end-game, as opposed to maybe 10 or something more traditional. He's also said that he wanted to let people learn how to play the game for the first couple of expansions, but after those, he wanted to change up the battle system in a major way. To me this alludes to the hybrid roles, getting rid of the class/job system so we have only Jobs (you see this with the ones they just added), changing up how cross-classing works or removing it altogether, etc etc. So I wouldn't say to not expect anything anytime soon. 2.0 and 3.0 is about as long as I'd expect them to give people to learn the basics of the game before they start switching things up in a way that won't hurt the playerbase too much.
Also, the dev team is flip-flopping on a lot of ideas right now. Healers DPS 'requirements', the state of end-game and how they truly want it balanced for, Tank DPS, all kinds of stuff. They'll get it eventually, but this is the time to experiment, because you don't want them doing that once they game is hyper established.