I am hoping the Materia system does not wreck the Job-specific when it comes out. One thing I am hoping for is one of two things.

1. Traits that materia can't top such as (Example: Red Wizard :P shut up you knew it was coming!)

Black Mage gloves could have: Intelligence +5 Magic Attack +5 Spell cost rate -25%

Some traits like that, materia doesn't have any type that can do that.

2. Full-Set Bonus: Under the effect of wearing all of a job-specific gear you get an awesome bonus.

Paladin's with a full set of job-specific gear on should get: -25% Damage Reduction.

Personally I would love both, but if I had to chose one? I'd go with Full-set Bonus. I like matching sets of armor. Maybe we could put atleast one materia into it as well, like some people have already suggested?