Unfortunately this doesn't work because the old world is ruine...changed. The quests are overly easy, mobs aren't even aggressive, have super short aggro range, there's no threat of death, and if you ever have trouble 20 NPCs will come to save you. The barrens used to be treacherous, the murlocs of elwynn were a threat, anything COULD kill you. No more.
Sorry, doesn't work.