I agree with the idea 100%. If you dont want to wipe Neltharion., make a PTR(see how it goes) realm at x1 with the same approach as Lordaeron and with progressive release.
Speaking from the point of view of someone that plays wow since Vanilla, i miss the fun of pvping or doing dungeon/raid with people that actual want something from the BG or the dungeons/raids.
The people that stayed here in Neltharion are gearing their 4th alt or something and i notice how little patiente this same guys have to do dungeons or raids. They want want 390 ilvl to make RHC, 28k dps for DS etc etc. So most who are still gearing or new to this expansion dont have a chance and they give up...this talking about pve. When it comes to PVP is worst, 90% of premade allie or horde are people farming HK, usually boomkin spammers and 3 shot rogues with BIS.
Saying people would eventualy move to Neltharion is bull****...the MAIN reason people are moving to Icecrown is RDF and not the hardcore raids of Lordaeron or even x1. A small % actually see all content like in blizz.
The sucess of Lordaeron and then Icecrown has to do with people looking forward to log in. Some want to beat the content in Lordaeron or enjoy questing in small pac, in Icecrown they know that they will queue and instantly be doing a dungeon or pvp..they will be having fun!
Fun, something is lacking in Neltharion for a long time.