A minor concern of mine is for new players coming into the game who will want to try this out. Mind you, the fact that even though it's going to be an available job in ARR it won't be until after the base story is complete offsets much of it, since by nature of the quest progression you'll be required to have at least one other job leveled to 50. Even so, I hope they make the terms of BLU being a limited job very explicitly clear in-game. It'd be a shame for some poor newbie to try to take time to level up BLU, hoping to make it a main job, only to find out they can't do level roulettes or use Duty Finder, and will likely be hindered trying to use the job to make any kind of post-2.0 progress without a good and diligent set of friends to take them through. Again, I don't see it being a widespread problem, but still a possibility that could discourage some new players.