If you could play any expansion, re-opened from blizzard as (Legacy Server) Which one would you have looked most forward to?
Vanilla - TBC - WotLk - Catacalysm - MoP (Don't think TBC ++ would have been released after first season).
Me personaly, i would love to play Vanilla / TBC and Wotlk, further maybe next 5-10 years. But let's not speculate on time frames in this case, and pretend it would be 2-3 years in each expansion before moving it to next one. But give naxxramas more time to be cleared before TBC release.