I was wondering if you have any thoughts about the changes to spirit/mana regen in 2.4. and how/if this will impect holy paladins?
For those who don't know, in 2.4 the amount of mana regenerated by Spirit will scale with your Intellect. It's a general buff to mana regen for Spirit-using classes.
I don't think that the spirit change will directly affect paladins, as we don't stack Spirit. I have heard rumors of a paladin wearing Druid healing gear and using [Darkmoon Card: Blue Dragon] to take advantage of the increased regen. Personally, I think such an idea is unlikely to really be effective, but you never know.
(Honestly, I expect Blizzard to nerf [Darkmoon Card: Blue Dragon] at some point, as it is a trinket which scales with levels. It will be just as good at level 80 as it is at 70, and as it was at 60.)
Indirectly, it will make priests and druids stronger healers, and they won't need to pop mana potions as much. However, most raids prefer to take 3 paladins for the blessings. What I think we'll see is more guilds dropping from 3 Paladin healers to 1 Ret Paladin, 1-2 Holy Paladins, and 0-1 Prot Paladins. Retribution is in a really good place at the moment, and an AoE tank is pretty useful. But the raid doesn't really benefit from having a second Ret pally (or a second Prot paladin), so there will still be a need for Holy Paladins.
I don't think the number of paladins taken to raids will change, but I do think that this change will give us more freedom to take on different roles other than just healers. And quite frankly, that's a good thing in my opinion. 90% of us healing was unhealthy.