OK then let me get this brain fart into some focus, you as a community will now KICK healers not DPSing inside a dungeon 4.x onwards. OK then enjoy the long queues as most pure healers say screw this and stop looking for duty and just either re-roll or just stick with premade.

How about Blackmages get kicked for not using the MP share on tanks that need MP for their mass taunts so that they can do a speed run
How about we kick DPS for not using Diversion because why would they want top enmity when they are throwing out all that DPS
How about we kick players for not saying Hello at the start of a dungeon

Seriously... WTF is up with the community? The healer damage will be a little bit higher than it is now with Cleric off but no where near as high as cleric on, so I would say their DPS would somewhat on par or little more than a PLD with Shield Oath on. They are HEALERS for gods sake. You have enough DPS in your group as it is!