I have played WoW on and off since February of 2005 and I have stopped playing wow multiple times because of how boring it got for me. And well I am going to play wow again for MoP but i highly doubt it will last long as all of my recent attempts to get back interested in the game have failed miserably. But me and my friends who play the game have had an idea which i think many people have probably have thought of, we want to play classic wow, but thats all we want to play, we dont want all the extra, we want all the strategy, all the fun, all the hardcore raiding, all the 40-man raids, we want all the team work it took back then, all the dedication it took. Now you can find 25 random people and go beat the main boss in the game. And you cant find 40 level 60s that want to raid. We also want this for BC and WotLK. We were thinking that you could make servers that go up to that specific expansion. Like a few servers (i dont know how many people one server can take but im sure other people would like the idea) that only have classic WoW. And another server that only goes up to BC expansion, and so on. How many people think this is a good idea, if alot of people do, I will send it to blizzard.
You can always try playing Private Servers which support WotLK and expansions like that, or even Vanilla WoW. But I don't think Blizzard will make specific servers to support selected expansions.