Should Cleric Stance be disabled in party instances?

[Parawill]

Tl;dr: Removing Cleric Stance would require a change in the MP Costs of our DPS spells because it is simply not worth it mathematically in terms of both MP and time (GCDs).

Just going to point out that if Cleric Stance was removed, the MP costs of a healer's DPS toolkit should be cut by over 80%. Having such high MP costs for such a low return in investment (damage) completely makes it not worth DPSing in the first place. To put things in perspective, I cannot one-shot a level 15 mob at iLvL 255 with my level 60 WHM with a Stone III. It takes me three Stone IIIs to kill one level 15 monster (non-firefly from clams) in Satasha Normal Mode, UNSYNCED!

If we look at Savage Content, Alexander Prime has around 8million hit points. With my pathetic non-cleric's (and non-crit) Stone III damage of 380'ish average, I am basically spending 530 MP to do 0.00475% of the boss' health. So to even do 1% of the boss' health, a White Mage would have to spend around:

If Alexander Prime (Savage)'s max HP is 8,000,000 and 1% of his HP pool is 80,000. How many Stone III's would it take to deal 1% of its hitpoints?

80,000 / 380 
= 210.5263157894737 * (MP Cost of Stone 3) 530
= 111,578.9473684211
= Basically 111,578 MP.

Therefore, it would require 210 casts of Stone III to do 1% of Alexander Prime (Savage)'s MP, which costs 111,578 MP. In addition, if we factor in cast times of 2.35 seconds (average with the amount of spell speed we have access to)...

210 casts * 2.35 Cast Time
= 493.5

It would also take 493.5 seconds to do that much damage, which is around 8 minutes.

As for MP costs... With my current pool of 16k MP, and 20% MAX MP Regen per minute...

16,000 MAX MP. 2% Natural Refresh = 320 per 3 seconds.

Total Refresh per minute is 6,400 * 8 minutes is...
51,200

Total Shroud of Saints MAXIMUM MP Tick Regen is 707 * 5 Ticks
= 3535 * 3 uses (because the fourth use would be beyond the 8 minutes)
= 10,605

Assize MP Refresh is 10%. 493.5 / 90 second CD
= 5.4 usages, rounding down to 5
= 1,600 * 5 
= 8,000

Total MP Refresh from Tool-Kit
= Total MP + Natural Refresh + Shroud of Saints Refresh + Assize Refresh
= 16,000 + 51,200 + 10,605 + 8,000
= 85,805 (+1700 from HQ Max Ether)
= 87,505

Not enough MP to actually do 1% of a Savage Boss' hit points. >_> While I do know that Aero 3 and Aero 2 exists, I'm pretty sure even with those DoTs, we'd still not have enough MP to do at least 1% of its MAX HP.

EDIT: Also, just gonna point this out too. If healer DPS is completely removed, content would be cleared slower, and the need for DPS to actual to do proper rotations spikes up beyond belief. So in the event where Clerics Stance is removed, DPS cannot slack whatsoever and must play really efficiently. Looking at how duty finder is already, I can almost guarantee you that some players will struggle doing not just trials or raids, but dungeons when running across the DPS classes that some healers are currently out DPSing.

That ain't gonna look pretty.