Just like PVE, the PVP modes have a huge famine of Healers in Frontlines and in Feast. Since healing either mode can be stressful, there should be some rewards for Healers to work to. Much like players have intensives to go as Tank for roulettes and farm parties for their special tank mounts, maybe having those same intensives can help with the lack of healers.

Maybe have achievement mount rewards for PVP healers, special titles along the way, minions, a strong reward for becoming a PVP healer. This can help with Frontlines having a huge lack of healers, and help with Feast queue times for many.

I'm not sure if tanks need the same rewards, since I feel like tanks are more common than healers.