I wish I'd known about these servers. I would play WoW again if it was the 2006 vintage instead of the crap its become. To answer your criticism, if Blizzard wants to keep WoW going forever, roll back to 2006 vintage, and focus entirely on new and interest dungeons and gear. Also put the level cap back to 60 and keep it there. New and interesting PVE dungeons was the only thing that made WoW great. Making the game "easy" for casual players was another tragic mistake.
2006 vintage WoW would be right before Burning Crusade came out and BC would be just about the time WoW started to suck and I quit playing. In 2006 there were 64 player raids, no constantly shifting level caps that constantly trashed all your gear, you lived to get to get to level 60 and collect PVE gear.
Every good guild on the server I was on, including my own, blew apart about that time, people wandered off to PvP to get the gear Blizz was handing out like candy to distract from the fact all their hard won level 60 PVE gear was being trashed and running Molten Core and BWL was officially pointless. It had become a waste of time doing PVE raids entirely which was the whole point of WoW.
In those days you only ran dungeons with people on your server, yea it sucked waiting to get groups sometimes but you actually made friends and learned to trust or not trust the people you played with on your server. When they started jumbling together pick up runs from all servers you didn't know and couldn't trust ANYONE you were raiding with. Dungeons just became a whirlwind you ran through as quickly as possible and half the time someone in the group would be a total ass and get away with it.