imo the biggest advantage palys have is holy sheild. But with hdins pretty much being the only strong chaosers and baal runners they would need it. I did 7 hours of baal runs in one day this week, and all but one had a paly runner. Id hate seeing baal runs only last 5-10 games cause the runner had used up all their juvs so they would die fast as shit. Leaving only 18% chance to hit the person whos getting everyone the much coveted 90+lvl status wouldnt be very convienent for everyone. If Blizz came up with a way to give more than just one char class the ability to do more than 15+ runs consecutively, I think that would balance it out some. I got a 91 wind druid pullin 4.2k nado with 7k def from a2 hell def merc, all I need is way more fhr so I can keep tele'in the hell around. Hammers just make for faster baal runs, plain and simple. 150,000 dmg floating around in the throne can clean house quite quickly. If Blizz wanted to make it a little more equalized, they might consider lowering holy sheild down to make it even for pvm and pvp.
The pvp with hdins will always be unbalanced with hammers, but you can over come that with enough dmg n godly fcr. But I say nay on a total unbalancing with palys... Let em keep the dmg, but lower that damned holy sheild..
BTW the other char that did the 15+ baal runs was a tele barb with 43 bo and I did about 32 runs with him, albeit I had a 92 fury wolf with lvl 32 oak, but reguardless :-D