This probably won't happen and I am probably beating a dead horse here but . . .
I seem to feel that WHM is taking up useful slots of the BLM skill tree, and the fact that we will probably never see WHM get any ancient magic (tornado, flood, quake), it is a real shame because all of those spells are extremely iconic to FF lore. Quake especially.
I feel as though WHM having these spells also remove the chance of ever seeing other light based nukes other then holy. (Such as Banish and Dia). I do feel as though WHM does need some damage based spells, however giving them elemental spells takes away from both the classic BLM and WHM lore.
This would not remove WHM's ability to nuke, as the light based spells can easily be given a fairly high amount of potency, and I am sure many people (not all) would be fine with removing some of BLM's abilities, in order to give them a wider spell range.
In saying that, I feel as though the whole spell system needs to have another serious look at. Spells should be decided on elemental weakness, not whether you are "killing 1 mob" (thunder) or you are "killing multiple mobs" (fire). Also let's face it, the ice spells suck donkey penis.
I would like to see the old mechanic return of Fire & Fira being single target, and Firaga being aoe (same goes with the other elements). You could do this across all 6 elements quite easily (with an animation rework of course). If you still wanted to give additional effects, you could do this within the element but I do believe that the reason to cast spells should be based on enemy weaknesses.
As for the compensation for WHM, Dia could become the current "Aero" spell line (bleed / DoT effect), and Banish could become the current "Stone" spell line.. (Just as an example).. Give them the same / similar potency and the WHM's in the community shouldn't have much to complain about. (I hope)..
I truly do hope that we see the classic FF elements return, instead of it becoming a bland "fire to aoe, thunder to single target", and never see anything else cast.
I am sure this topic has been raped to bits, and the fact it hasn't changed (based on a previous live letter showing WHM cast elemental spells) shows that it probably won't, but since everyone is waiting for beta, the issue should be raised again.