Kinda off topic, but;

They should just condense all the existing Classes into one, and have it work similar to 1.0s Physical/Skill Levels. Equip a weapon without a Job Crystal, you start leveling those skills on Freelancer while also raising your Freelancers level to the cap. Jobs are unlocked the same way as currently (Paladin requires you have have Gladiator skills and Conjurer skills), skills are unlocked by raising the Skills Levels. Give Freelancer the typical "Improved stats the more you master" trait to make it a viable option come endgame, and....

Done. You want Carbuncle? Play Freelancer with an Arcanist weapon equipped for those skills. All Classes become viable at endgame in one neat little package.