I think SE should add Time Mage and Necromancer and a polymorph job.
Time Mage is the master of time and space thus they should get Comet,Meteor, Regen spells 1-6 or 7 as well as regenga since heals over time . they can be a big dotter maybe SE can bring Demi as their dot (Damage Over Time) spells. They would also get haste 1-4 and hastega 1-4 slow 1-4 and slowga 1-4 stop would be their version of petrify. Refresh not bad either also Regain spells.

Necromancer would work like Summoner you would get a pet as a spell at certain levels as well as a bloodpact type of ability but it would be called something else. You would only be able to have one undead out at a time. They could get all the spells the mages currently dont have that would be perfect for Necromancer but the undead would useit with their version of bloodpact so could use spells like Curse,Doom,Death,Amnesia, some more do exist just cant think of them at the moment. just like with summoner when you use the bloodpact ability they have they take from mp but unlike summoner they won't drain mp while they are out. Their main weapon like said earlier could be Scythe and Staff. Pets could be stuff like Demons,Evil Eyes,Imps,Lamia,Zomie,Skeletons,Ghosts,Evil Weapons,Hellhounds,and the larger looking imp type from Xarcabard S whatever they was called.
*Oh and to the members of Square-Enix who said having a Necromancer was silly because undead do not walk during the day, Undead walk around in caves, mines and crypts at all hours of the day in your game! Oh and undead are sleepless they are not going to care if it is day or night. if they are going to be restless they will walk regardless!

Polymorpher could turn into giant. But at a time limit with a recast of maybe 5 minutes or 10 minutes. If they turn into a giant they could do double damage for the time limit etc.. Maybe even triple damage at higher levels maybe somewhere between 80-99. could get some cool crush job abilities maybe a bolder throw attacks. They could specialize in 2-handed weapons >>> club sword axe katana staff scythe etc...