Unless cooldowns, mana costs, being able to toss multiple explosion pots, bard spells being effective in PvP, etc, etc, etc, I don't see things changing from stacking either swords or eval for PvP.
-Necro: cast times, and damage on every spell other than wither makes them obsolete. With wither you have to be red to be able to hit a blue/gray with it, and it eats mana so fast you have to be in wraith form to be able to spam for the duration of fights.
***** Now there used to be a use for the cleric spell to drain stam + strangle + vengeful spirits, but the stam drain spell was nerfed recently to no longer stack on a player making that entire combination useless in almost all situations*****
-Cleric spells: Nothing really here to do damage
-Barding: Nothing really here to do much of anything other than a firehorn that has a really long cooldown/chance to blow up on you
-Druid spells: Cast times, and damage are horrid. Certain spells (wildfire I think) have a purpose for people running protection when vs mages as it interrupts them.
-Spellweaving: Not useful in PvP iirc.
-Alchemy: Can only toss one pot every 4 seconds. People just run out of the way, and the damage is lower than a harm spell. Now, if you were able to machine gun 3-4 pots at a time with high (like 300+ alchemy +150% enhance pots) then things could get interesting. As it stands, 1 pot every 4 seconds makes it useless.
-Ninjitsu: Reliant upon being able to hit your opponent in melee, which we already know if a large issue currently.