Life of a Nin

Lore said a while ago that the easiest way to balance Tanking classes was to have us doing DPS as our off-role. Fundamentally this goes against the way the Paladin class is currently constructed, in that in TBC we were basically forced into off-healing due to the very low DPS we could put out in Tank gear. With the change to strength based Tanking then we have to reconsider this role. For the purposes of this comparison I am taking only Warriors and Paladins, Bears and Death Knights are far different beasts for a simple analysis since their combat resource is much more easily regained in combat and have mixed DPS/Tank trees while the Paladins and Warriors have deep pure Tanking trees.

The issue with this is the scalars on our threat modifiers:

Paladins
Threat = (Holy Damage * 1.9 * 1.43) + (White Damamge * 1.43) = 2.7*Holy + 1.43*White
[the 1.43 on white I am not sure of]

Warriors
Threat = Damamge * 1.45 * 1.43 = 2.07

Neglecting Paladin white damage because it is typically < 10% of our actual threat the threat comparison is thus:

Warrior Damage * 2.07 ~ = Paladin Damage * 2.7

Thus in an off-tanking situation Paladins should always Tank, because not doing so is detrimental to raid DPS. Following the maths through:

Paladin Damage = Warrior Damage * 2.07/2.7 ~= 0.76
Warrior Damage = Paladin Damage * 1.3

Thus to improve Paladins to the extent where we are not Tanking because not doing so is detrimental we need to consider deep protection (upping Retribution's damage by 30% would be a no-go) as adding this kind of talent, something akin to:
Guarded by the Light:
Self: Passive, Ranks:1,2,3
Increases your spell power by [10/20/30]% of your stamina. In addition increases your Holy Damage by [10/20/30]%
Thats a little overpowered though, considering that ups our threat by effectively 30%, thus it needs to be tied to a trigger. My thought would be Righteous Fury, thus giving us a toggle like Shadow Form or Bear Forms, becoming:
Guarded by the Light:
Self: Passive, Ranks:1,2,3
Increases your spell power by [10/20/30]% of your stamina. In addition increases your Holy Damage by [10/20/30]% while Righteous Fury is not active
Taking into account the Blizzard desire to allow Paladins to be healers, and the current secondary benefit of this talent not being beneficial to Protection Paladins (we don't really crit), I would suggest as a compromise (and completing the trigger effect on Righteous Fury):
Guarded by the Light:
Self: Passive, Ranks:1,2,3
Increases your spell power by [10/20/30]% of your stamina. Increases your healing done by Holy Light and Flash of Light by [6/12/18]||[10/20/30]% while Righteous Fury is active, increases your Holy Damage by [10/20/30]% while Righteous Fury is not active.
Thus you have the start of a true Hybrid with the functionality while not Tanking to actually fill a useful raid role. Detractors will state that this is a lot of bonus healing / damage, why take any other class. The answer is of course that yes its powerful, but the Healing aspect is realistically a niche role only useful on a few fights such as Naj'entus, in most other cases more DPS is always better than more Healing (because if you turn up with fewer Healers than are needed you won't succeed), thus giving a secondary option to those that want to take it or have the raid to support it without actually penalising the true off-spec role we need to fulfil for an easily balanced raid.