Old Content being Reborn is something that gives people some incentive to come back for more, especially veterans who remember how it was.
Yes New content is good, but refreshing the player's memory with some of the great parts of Vanilla or BC in a new perspective and difficulty should be praised, not QQ'd about. No one will ever be happy and they're not making the game just for those who feel so madbro about a little change, everyone demanded ZG come back and be glad that it did.