I have done this hon, I rerolled to make others happy and be able to progress however in the end I wasn't enjoying the game as much as I felt I was playing more for others then for myself. In the end it's a game, and I hope for you that you shall enjoy playing as a Holy Paladin equally as your Priest. However after having watched your progression movies and logs (I was Holy Priest for a while and enjoyed watching you perform in said movies) I believe your guild would've been fine nonetheless as in the end the player makes the difference not the class or the gear. I performed well over my item lvl countless of times and it just made me believe me more in that classes are just...there to define the abilities, but the role is the person who plays it.
Wish you best Healprincess, your guild hopefully respects you enough to one day understand you wanna go back to Priest. I however won't make that decision ever again, I am back a Priest and enjoying it every minute of it, this time I play for me not for others.
I hope Hellfire Citadel will go great for you, I still wished on having downed Mythic Blackhand, but patch game in too early for us to benefit from it.