I feel like at some point-Blizz should use the Caverns of Time to go back to the First War, and the Second War to see the Alliance Kingdoms at their prime, to see the Horde attacking. Just feel like creating an expansion where we go back may be counter productive but really really fun. Full out war-get to take part in battles. Like not just a dungeon but an entire world that take place back in time.
What do you think? Should this happen eventually? Maybe when Blizz runs out of ideas? (They Never WIll) But still would you like to see a full world version of the First Second or Third wars?