I'm fine with going as far as TBC but everything after that is a downward spiral into imminent decline and releasing wotlk + other expansions just means that we'll have to relive the horror of WoW becoming shit all over again. Not sure about you guys, but I'd rather not do that.
I recall the majority of people liking WotLK the most and I’d be fine with WotLK. However, The “downward spiral” is a nonexistent issue - if you look at private servers, it’s just Classic, TBC and WotLK. No one is interested in i.e. Cata servers.
On another note, what they should do, especially with shit such as potential WotLK servers, is to have “progressive/gated content” or whatever, meaning that I’d youre on 3.3.5 it doesn’t suffice to just grind 5mans to go straight for Icecrown Citadel, you’d have to do Naxx and then Ulduar. I think Classic is like that by design but I may be mistaken, I’ve played it for several months but then TBC came out when I was level 50-something, so once again I’m not sure.