This will never happen but other miracles have occurred. It might be fun to discuss how it might have worked. Tanking would be a lot more engaging and possibly even more fun. How would hate and things work though is the question. For the most part every class still has a good setup for skills even without tank stance but still needs the hate gains. Hate building skills could technically just build the amount of hate they normally would from current tank stance hate modifiers. I think it would be interesting if both tanks had a healing active geared towards certain situations and mob groups. A punishing active possibly more centered towards tankbusters both as 30 second cooldowns, gcds, and no costs to use. The way the Tankbuster ones would work is that you press and hold the button. While holding the button you can cycle through a maximum of 2 gcds. After skipping 1 gcd, the tankbuster skill is automatically released as the 2nd gcd becomes available and you only do a 10% damage reflection. If you time it well enough and you release it before the next gcd becomes available you do the max 50% damage reflection. This might be a poor explanation without pictures but I don't have any.
Rampart would no longer be a mitigation cooldown.
Possible setup:
Edit: After thinking about it a while, it makes sense to remove the stances and just free up the space on hotbars so all of wars skills are available at all times.
War
Hate combo: Butchers block
Hate AOE: Overpower, Steel cyclone
Hate ranged: Tomahawk
Active mitigation GCD
Inner Beast:350 potency Healing based on damage done 30% damage reduction for 5 seconds (gives 50 beast gauge)
Unchained (button must be held and released after attack): Howl before next incoming attack leading into a more powerful looking 2.0 brutal swing animation, 50% of damage received and mitigating 40%.
Non active: Vengeance only change mitigation %30 to 20.
Dark Knight
Hate combo: Power Slash
Hate AOE: Unleash, Abyssal Drain
Hate ranged: Unmend
Active Mitigation GCD
TBN: 350 potency magic damage heals for damage done mitigates 30% and lasts for 5 seconds (gives 50 blood)
Grit (button held and released after attack): Hunkering down into a powerful thrust position and sword gathering energy leading into old 3.x reprisal animation Countering next attack returning 50% of damage mitigating 40%
Non active: Shadow Wall 20% mitigation 120 second cooldown and duration 15 seconds, gives some MP on hits similar to blood price.
Honestly I dont feel comfortable making a PLD one since I dont play it but here goes.
Paladin
Hate Combo: Rage of Halone
Hate AOE: Flash, Circle of Scorn
Hate ranged: Shield Lob
Active Mitigation GCD
Sheltron: Shield bash for 350 potency healing for damage done, blocks all incoming attacks for 5 seconds at -30% mitigation. (gives 50 oath gauge)
Shield Oath: Some type of shield energy gathering animation leading into a Shield Charge animation for 50% of damage received mitigating 40% (button held and released after attack)
Non active: Sentinel 20% mitigation, 15 seconds, and 120 cooldown. Receive MP on hits
I'm unsure about paladin due to oath gauge skills, someone who plays it could do a better job as to which skills to to lose/keep for gauge.
I think it would be more fun as a tank and more engaging. Not worrying about spamming a bunch of instants before a tank buster or anything like that, just reacting to it coming instead of preparations for it in a sense. Maybe I made the mitigation too strong, or classes not unique enough I don't know. The 2 types of active mitigation could still fundamentally operate differently in how it does the damage or receives resources, there's lots of possibilities. I kept them for the most part the same cause I didn't want to create a situation where one was stronger than the other for the actives. This was just a quick rundown of an idea I've had for a long time but never posted cause well... it won't happen. At least its something more fresh to talk about than the everyday tank thread. The recent stance change threads has rekindled my thoughts on this.
Edit: I guess the simplest way to do it would be to have the first active mitigation tool at lvl30 when you get your class. The second one at lvl 50 to prepare for boss content and start learning to use it.