Poll answered by mmo-champion visitors, and only the ones that care enough to vote? That's the "few dedicated players" I mentioned. Well, maybe more than a few, but percentage wise it's still low.
Don't get me wrong, I'd love to play some "true" vanilla on stable servers, even just for nostalgia, but I simply don't think that Blizzard would do it. The poor state of some things in vanilla wasn't the result of careful design. Things like poor class balance just happened because Blizzard didn't have enough time while rolling out updates, or it was simply quite low on the priority list. Since they now have the time to polish the classic WoW before re-releasing it, they will most likely spend it on stuff like this. Ret paladin being trash in PvE might be a cool for nostalgia purposes, but not really for the game.