I just wanted to impose an idea that I was thinking about yesterday night when I was thinking about future expansions and things they could redo or rework to make the playing experience better, and this idea came into my head. As you may know, World of Warcraft has been going on for 10 years, and since the characters that we play as have experienced what like 5 years of heroic deeds defending Azeroth, youd think theyd be more than just an above average hero who is good at what they do.
Now in future expansions we are gonna have to deal with super powerful beings such as Sargeras, the entire Burning Legion, Azshara etc. and although we have stopped the Lich King, Deathwing, and Kil'Jaden (spelling), these foes arent as strong as whom we shall face in the future.
Which brings me to the idea behind an expansion-long questline for each class (also no Legendary item to be obtained if they follow this guideline) in which you upgrade your character, make them more powerful, in order to combat the Legion and any other army we must face. Im thinking along the lines of bumping up their status, which I will elaborate on in the next paragraph, in which the questline upgrades the users abilities and powers in each patch leading up to the final patch in which they master their class.
The idea I had, which will be easiest to explain by using another class position within the Mage Society, that would be equivalent to moving to Arch-Mage status. Im saying for each class they have a long and difficult questline that shall help the character prepare for that expansion.
For instance I'll use mage first: Since we heading to Draenor, Khadgar has believed he must train apprentiance after what happened in Warlords of Draenor (since it leads into the next expansion following it) and believes another powerful being is needed to help wage war that will becoming. Agreeing with both the Kirin Tor and Dalaran, they agree they must train the heroes mastering the arts of the magii in which to make them more powerful. You must collect mystical artifacts from Draenor and kill super monsters, similar to the guy you had to fight in the Warlock Green Fire quest that proves you are worthy of the training and the title.
Each class would have one of those long questlines going over the course of the Expansion. I cant really think of all the positions someone would have or who would train them for each side so he we go:
Warrior: Warmonger. Taught by High Overlord Varok Saurfang (Horde) and someone else for Alliance.
Paladin: Highlord of the Light. Taught by Tirion Fordragon. Helped by Maraad.
Hunter: ???. Alleria Windrunner (Alliance). Rexxar (Horde).
Rogue: Ruler of the Shadows. Wrathion or Garona (Horde) and Maiev Shadowsong (Alliance).
Priest: Archbishop. Velen
Deathknight: "Lich King". Darion Mograine
Shaman: Elder of the Earthen Ring. Thrall
Mage: Archmage. Khadgar
Warlock: ???. ???
Monk: ???. Taught by each of the Celestials.
Druid: Archdruid. Malfurion Stormrage; Cenarius
If you like the concept you can change the Titles .
Since this also just an expansion wide quest series, you also get a title and garb for completing it as it wont be necessary for future expansions as this will be considered the "Legendary" questline of the expansion.