Youv'e to realize that Knight gives lots damage to BWs and Engineers just by being around.
WP and RP will still remain supreme to average AM who can't use EoV properly and in the end does really low healing.
It would hurt mostly, because it would be nerf to faction for most basic group compositions, as those are most core classes, while you would also buff opposite side at same time. Keep in mind, Order can't give as much CDR to AM for EoV, like Destro gives to Shaman to abuse Fury of Da Green without hurting group much (BO + Choppa).
Average DoK is supreme to other average destro healers even now. Giving him more healing, would make the gap even bigger. No?