We can totally try a "great experiment" of increasing healing in PvP again.
I can predict the results right now however which is why I've avoided it. Healing Increased --> Non-Healers get super frustrated that they can't kill anyone --> Healers say everything is perfect --> Another subset of the world says "No one dies now you killed PvP" --> Another group says "Find a middle ground" --> Another group says "Stop changing the game!" --> Another group says "Just add heal debuffs" --> More folks call for healing nerf --> Repeat.
Also, of all classes in RIFT rogues have always had a higher percentage share of the total population than any other calling. There is also some data that points out that more rogues engage in PvP than other callings.
It's not a new trend, but it does certainly look more pronounced these days.