That goes completely against the very structure of the game though - the FF series has always had as a major innovation the ability to change your character's class (usually through variations on what is known as the Job System). Thus the FF MMORPGs (FFXI and FFXIV) both utilize this important gameplay aspect of the FF series - this is not like other MMOs where your character's class is static and becomes their personality. Here the Armoury System is virtually analogous to real life, where for example, you pick up a hammer and saw, you're now working in carpentry, but pick up a bow and arrow, and you're now using archery etc. The whole 'class' term was a misnomer really.

Making your character static to it's class will never happen because that violates one of the main advertised features of this game, the ability to change your class at will on the one character at any time you feel like I'm sorry to say.