There are development problems coming should SE remain married to the original games weapon/job change system. For instance the calls for more jobs such as dancer, thief, bluemage, redmage among other favorite previous game jobs, these jobs utilize weapons already in use and there are only so many existing weapon types you can lock a job/class to. Future development requires more flexibility or the game will stagnate and lose subscriptions it's not about ability redundancy naming an ability one thing or another does not matter the players will not lose interest over that.

Removal of the base class is inevitable and essential but not just that. It will become essential soon to remove the weapon lock and switch to using the crystal/soul stone to change jobs. Most already ignore the base classes and use equip sets to automatically bypass the base class. 3.0 presents the prime opportunity to make this switch permanent.