Hmm. Well if they're willing to give a DRK traits to change tanking skills to DPS, then they should make DRK build from MRD instead of GLD. Already a 2-hander type with good damage, a damage buff, self-healing, etc. Just seems a better fit, IMO. However, what happens when a DRK gets level sync'd below the point where he gets those traits? Does he suddenly become a tank again? That means you can never run Sastasha as a DRK DPS, which would be very disappointing. :/
RDM from FFXI had access to white and black magic with an emphasis on buffs/debuffs. Having just THM as the subclass means no white magic, and having 2 subclasses is going against the established system a bit too much. Arcanist has damage and healing spells, so I think it would make more sense.
Similarly, FFXI Scholar was a mixed-magic mage, but no armor and a greater focus on straight dmg/healing over enhancing spells. The fairy was something completely arbitrary so that it could build from the ARC, which is a pet class by design.
SAM I would love to see as a DEX based tank. Having both SAM and NIN build as Tank and DPS respectively from a Fencer/Swordsman class that uses katanas would be perfect!