I personally wish they would expand our current class system, rather than tacking a secondary job system onto it. FFXIV's class system gives much more flexibility than role-based classes in other games, where you can essentially 'roll your own' class. Want a black knight? Pick a gladiator base and add some thaum spells. Want a white mage? Mix and match the relevant con/thm spells.

The only problem currently is that we don't have enough diversity to span the full range of classes. Want a bard? Not quite possible with the current system, but could be if the current system is expanded enough (bard is unique enough to warrant its own class - it would make a fantastic DoM addition).

People keep wanting to rewrite the entire book for everything in this game while overlooking the fact that the game's base is really, really solid. The main reason that I pre-ordered the CE after playing the beta was that despite the many problems the game had, it had a fantastic base to build up from.

Such is the same here. Instead of trying to redesign the game around a second, arbitrary class-like structure to force players into different roles (something that should be moved away from anyway), expand and build on the current system. Add bards and arcanists; streamline current class abilities; add feats and other character customization options to help you build the character you want to play.

In my opinion, watering down one of the few things the game was praised for in reviews (the class system) is a mistake.