That again... I repeat myself for the xxx time:
1. Quests are good if you don't do them because they are quests like "uhhh where are the next quests?????" At the moment there are simply far too much unreasonable boring quests you just to because they are there.
2. How about adding Multiplayer? WoW Supports Multiplayer gaming as experienced players who play on max level know. Why is in the entire open world not a single area that supports multiplayer? Not just "you can do it alone or with x" but more like "you only can do it with x or it will be much more rewarding with x"?
3. Scenarios: PERFECT stuff for leveling! Multiplayer [x], active lore development [x], more potential for challenge and ability usage [x], no need for heal / tank hence fast ques [x], very easy to develop (as they stated) which could mean MANY of them to get variety [x]
4. Downscaling dungeons with daily quests instead of passive browser rewards that make dungeons even the bad mop ones actually worth the wait and struggle (that this time came with the huge itemlevel scaling issues). Make 90s able to go nhc stuff downscaling them! Gives a huge pool of dungeons that will less likely look and feel all the same after 4 weeks.
5. Add some kind of grinding areas with buffs and treasure rewards for the endless killing fun! Play the game instead of reading how pandabob hid his carrot under some rock!
And the most important: BALANCE the xp/h of all that including pvp and questing!