I myself would love to have a tool to reduce healing done to certain targets...
And a tool to beat sl/sl locks... I'm sorry, maybe I just suck, but 13k hp and 450 resil, while all damage they take is reduced to 80% is just unbeatable for me... Not to mention the pet, who eats my buffs, does damage, will not die, and silences me in the rare ocassions where I could place a nuke...
But what can I say? Will never happen right? So I will just keep loosing to healers and sl/sl locks (and most likely any other kind of lock also).
I dunno, actually mages are good in raids as they are, and many claim them to be good in PvP also (I disagree vs a bunch of classes), so blizz will just not give it a look until mage-players start quitting (honestly, why should they spend money, when its not good to prevent loss). So all in all, I could imagine a ton of things they could do, but they will never happen..
They could actually give the arcane tree more damage, because now the arc nukes (i.e. AM) get LESS spelldamge than fireball compared to the casting-time, unlike reported by some guys. Only thing in arcane tree is the threat-reduction.
Also their crit-damage is lower.
Frost is cool vs some classes, but some healing classes and also rogues and locks will give any frostmage a hard time when good-geared. Some people might say different stuff, but if they would take a short look at some nice PvP-vids, where even some REALLY skilled mages need 1min to kill a lame-geared druid, using all their CDs, they might realise that I got a point there.
That said I don't really believe anything will be done to fix the stuff at least I believe to be unfair, but some nice ideas...