Level cap = 60.
All experience reduced and new way to level opened (you chose alternate start at character creation screen).
1-10 = You start in Eastern Plaguelands investigating Scourge threat under Argent Dawn banner. You end up killing Kel'thuzad.
10-20 = After Kel'thuzad is dead, you are summoned to Shattrath as Dark Portal reopens. You gather Sha'tar reinforcements to lay siege on Black Temple (meanwhile you are informed on progress with fighting Burning Legion threats such as Kael), and you end up defeating Illidan.
20-30 = After Illidan is (presumably) dead, you go back to SW/Orgri just to discover it's invaded by undeads. You fight them off and then you jump into a boat right to Howling Fjord. You gather up reinforcements and kill KT again (a small quest), and after that you get to fight on Argent Tournament. After that you jump to ICC, see bodies everywhere and run up with Tirion to kill LK. He gets frozen, you defeat LK.
30-35 = Before you killed the LK, there are some earthquakes. After you kill him, there are even more earthquakes and you have autoaccept quest that you need to go to Org/SW to check in what's going on. You discover that when you were in Northrend, Deathwing got our and spew some havoc, but cities got at least partially rebuilt. Thrall summons you to Hyjal where you kill off Ragnaros in a questline, and after that you help Thrall with killing Deathwing in Maelstrom.
35-45 = When you're in Maelstrom, you see some zeppelins. They give you a rope, you climb on it (and they saved you) and you discover that there's a war in Pandaria and Garrosh has gone crazy. You go to the vale of eternal blossoms, discover what happened and in a questline where you kill off Shas, you get informed that you need to go to orgri ASAP. You discover dead bodies leading you to throne of Garrosh which you help defeat.
45-50 = WoD storyline, shortened - you track down Garrosh then you spy on Gul'dan, you fight his minion Mannoroth, he summons Archimonde, you kill Archimonde. Yay.
50-60 = Legion storyline
It should make leveling significant and meaningful again. It would never be outdated. Blizz would use vanilla assets for 1-10, etc. Everything would be instanced and phased like DK Starting Zone. We'd have parts of zones instead of whole zones, etc.
Levelling 1-50 would take like 15 hours of /played. 50-60 would take the same as it takes now. When theres new exp and 70 lvl cap, 50-60 experience would be reduced and would take as much time as 35-45 for example.
Pros:
- Not many resources needed - only thing to do would be questlines. We have models, voices, zones, everything is there.
- Lore-shitshow fixed - no more timejumps from Cata to TBC, to WotLK, to Cata, etc
- Level squish with stat squish, no more millions of HP. BiS tank would have 12k hp full buffed, normal dps would have like 3k hp. 500-800 dps avg.
Cons:
- prolly would take a raid tier, but it's nothing compared to Cata zone overhaul