Why would there be anything wrong with Cleric Stance in party instances? Do we WANT a healer to be useless 80+% of the time?
At that point, I'd feel obliged to trim out the healer entirely on any dungeon that we overgear enough to forgo it, or doesn't facilitate mass pulls anyways.
Why shouldn't it? We demand that dps dodge and that tanks deal damage, so what is wrong with expecting that a healer be idle only insofar as is required for his mana? Heck, it's no different than if a dps just stopped attacking outright after having dealt x dps, or the tank didn't bother with more than a couple cooldowns ever. That's your output. The damage is just as much your toolkit as the heals. The healer has been the highest-output role in the game since 2.0. Why shouldn't it be maximized? I'm all for finally adding some cross-role synergy and requiring DPS to finally do something something extra, but we should always be looking to do more, not less. The purpose of the healer is the same as anything else: output. If someone dies, then the healer and to whatever degree that person's failure to dodge are to blame for the lost dps during death and across Weakness, but honestly if a DPS is doing some 20% of his or her theoretical dps, the healer's doing twice as much and would have to make a full cast to ressurect him, with only 30 seconds left in the fight, limited mana, and no need for that DPS in the remaining mechanics... you benefit your party more by ignoring the fallen and continuing to DPS.
Your "role" is fluid. There is no hard "pledge" to sacrifice your party's progress or output in order to keep everyone alive or resurrected as quickly as possible. You keep people alive in order to further party progress and output.
Mastering that concept, figuring out how to help your party to do its best through direct and indirect contribution is what makes healers fun for me, and I'd actually really like to see more of that. Imagine if you could use Aero to accelerate an allies movement speed for a brief moment as to stay in an AoE until the last possible moment to dodge it but still being able to safely do so by way of that movement buff. Or if you could use your earthen damage dealt to improve your following stoneskins, or even summon an LoSing earthen pillar with limited HP. It wouldn't be healing, but it would still be creative means for contribution, much like best weaving in our dps or allowing our tank to better weave in theirs is now.