Originally Posted by
Kralljin
No, it just shows how shortsighted you approach this whole thing.
Sure, you can say, "there will be a lot more tanks!", but you know what also going to be a lot more?
Prot Pallies.
Lots of them.
And those sure as shit don't want their "regular dungeon group", they want to AoE that down, after all, that's why they're prot and reap the advantages of this.
And there you will have to deal with a similiar fallout as you did with the Melee / spellcleave during Classic.
Prot Pallies enable the AoE meta, the more you have of those, the more common the AoE Meta will be, with all its consequences.
Another issue you'll have to deal with is that you'll lower the overall difficulty of TBC, because you can now just adjust your number of tanks / healer on the fly.
Boss can be done with fewer healers? Oh well, some of them should rub their hands together and switch dps!
A healer is slacking? Let's just switch a dps to heal and try again!
Furthermore, it's going to exert pressure onto every hybrid to have a 2nd spec for those situation at the ready, this will go even further where you'll likely see the expectation of a hybrid such as Enhance having an Elemental spec at the ready, in case an Ele doesn't show up, or vice versa.
That applies to virtually any hybrid and also comes with the obvious expectation that you'll collect gear for your 2nd spec.
Add to this, you'll basically kill Prot Pally as a main spec, there is no reason to have a "main Prot pally" in your guild when dual spec exists.
Have a Ret / Holy grab some Prot gear, respec Prot for Trash / certain boss fights, else stick to Ret / Holy, Feral / Prot Warr are much better suited for the rest anyway.
This, of course, also comes with the expectation that a lot of Pallies also have some Prot gear and Prot 2nd spec.
Putting aside that every Pally can just AoE farm stuff whenever they feel like it (which is really bad for economy), whereas without dual spec, it's largely limited to people that actually stick to Prot.
Lastly, you'll even have some people taking a 2nd spec just to improve their performance on some bosses, Warlocks the prime example.
They will likely consider going Affliction on a council boss, or an AoE spec on some AoE heavy boss.
Taking into account the existence of some situational but extremely powerful talents, such as nether protection, you'll further open the door to potentially trivializing certain encounters.
I can absolutely see that Warlocks will have a 2nd spec with Nether protection at the ready for certain encounters, simply because it's such a broken talent in situations where you can take advantage of it.
Especially when also take note that dps taking less damage, means you might also cut healers.
And the last thing TBC needs is more reason why Warlocks are superior to other classes.
Those are the potential pitfalls of introducing *new* mechanics into a game that was not designed around it.
Changing existing mechanics is not the same thing as adding new mechanics.