They should focus on addressing issues with the jobs already existing. Then focus on creating more jobs options from the existing classes. Like Marauder could go into a Berserker dps job, Archer could become Ranger, more DPS than bard with no support skills. Rogue could become Blue Mage or Dancer, Pugilist could give in an evasion based tank job like Brawler or another DPS like puppermaster. Red mage could be from gladiator. There's a lot of jobs they could create from the already existing classes and they would be easier and faster to create.
As for SAM, i would rather see it as a DPS. We need another melee 2h DPS.