Looking at our 2 main mage skills:
Enfeebling, is nice to have when they work, the problem being just about every enfeeb we have other jobs have or have something bit better. So as the enfeebler role in the group, why bring a dedicated when your pretty much have it already.

Enhancing, this is super important to most players for endgame events. When it comes to RDM 99% of our enhancements are self which makes them pointless, and to add insult on injury a sch with /rdm can AOE a good percentage of our self enhancing buffs.

Solution-
Enfeebling - Give us more unique enfeebs, and give us some AOE versions so we can be the crowd control (do this w/o some sort of ability like sch)
Enhancing - More non self buffs, but these also have to be AOE or we are just back to being the cycle mage of a few buffs.

Those 2 things will give us more of a role in a group.