There is a post about Classic servers, but the OP asks people that dont think Classic servers will work not to post there.. So here a post to discuss why they will not work.... No flaming, just opinions please... and offcourse its okay to disagree with me, as long as you can bring arguments on the table..
The strength of WoW is that it has allways been moving forward every expansion pack adding just enough content to make the game feel semi fresh... untill now, they did just great with that, as the game is still very much alive after more then a decade.
What they need to do, is repackage all the level 1 to 100 content and make it available again at level 110 (assuming this project will be done after Legion gets finished) in a kind of time travel package where people can choose the difficultie of the content in a kind of Diablo esque system... with 3 levels of difficulties/settings. They could even have a vanilla version of the old world available in this(but that will not suit the purists that want Vanilla WoW back). This allows people to choose the kind of challenge they want when going trough that content, content many probably never even played..
If they can give people enough reasons to revisit the old lands, it could distract from the lack of current end level progression... IF they really want to make it attractive, they will add new questlines from time to time that will take people back there (in time) and set them off with the major story lines.. But they need to make the content worth while for everyone to do... there should be some kind of progression system..
So far classic servers never worked well for any game, there was an initial rise, but it allways fell quite fast again, except for the small group with dedication.. Sure a small group will play Classic servers initially, but a huge majorrity will stick to the current game, most players that never actually played Vanilla will recognise vanilla WoW as old fashioned and not enjoyable. Let me ask you this, how many of the current WoW population played Vanilla?
To get the community feel back, we once had in old MMO's Blizzard needs to be innovative and add new features that will make people communicate and work together again... this also could be as part of this relived content... with the hardest level of the content requiring small groups for many things to archieve... And other innovative features..
Best MMO experiences : EQ(PvE), DAoC(PvP), WoW(total package) LOTRO (worldfeel) GW2 (Artstyle and animations and worlddesign) SWTOR (Story immersion) TSW (story) ESO (character advancement)