Make LFR easier to kick or punish poisonous players who grief and do stupid shit. Less scenarios and more 5 mans! Make 5 mans more challeging! Make scenarios something you do while questing to farm exp, then heroic scenarios and heroic 5 mans at end game. Fix the bad RNG from loot drops for example, you have a raid and no one in your raid wears mail, take all mail loot off boss tables so you have better chances of getting things you actually need! A new class every 2 years, 3 new races Ogres = horde & Arrakoa = Alliance & Ethereal = neutral then choose a faction like Pandaren. All raids and all 5 mans are scale able and you can do them at level cap and you get scaled down to make it challeging and you can join groups in the Raid browser.
Okay, sorry now it's turning into a wish list.
A new class every 2 years? Twice as fast rate as we have now? I'm out.