instead of nerfing to be able to PvP, do it different. Buff the HP with like 100x, don't nerf any skill whatsever. Bring a debuff before to all starting in the arena and for example lock the chosen skills.
Create PvP shrines, like phys-immune for 10 sec. / life regen 20k per sec for 10 sec etc. and make breakable objects and such (think about the anti-rush boulders in sc2) This is far easier to make and needs no balance or a lot of blizz work, it also gives some tactics and skill
it just needs to be much less work for blizz otherwise they will never intergrate PvP at all
The only problem with that is it still creates an issue of balancing pvp and pve as one.
I firmly believe the only way they will ever make pvp not a massive one shot fest is to make items provide 0 stats in pvp and have characters do a % of players max hp per hit against players that way blizzard will never have to balance items for pvp and players will never have to farm gear for pvp.
Lets face it nobody wants to play ''i farmed 1k hours so i one shot you'' pvp its lame just make items for vanity in pvp.