They've already said they're redoing the way those work.
That, combined with the fact that, unlike all the other classes, ROG has an actual set visual aesthetic, tells me we might be seeing a split.
It's restrictive as it stands because there's not much tweaking you can do when adding a new job to suddenly make it take another role entirely.
For example, if you wanted to make CNJ a DPS job, you'd give them ALL DPS abilities but they'd still have some of the strongest heals in the game. ACN/SMN/SCH is the only real exception since the class/jobs were designed from the beginning to be split between heals and DPS.
The only current way to keep the system is to have certain abilities tweaked by being a different job a la Carbuncle->Eos/Garuda Egi