Eventually Deathwing will make it to Azeroth and tear the world apart. If I had to make a guess as to why he isn't here yet, it would be because he's having some issues making it to the surface. Those tunnels are only so big. Much like the doorways to the AH and other buildings, they are not mammoth-friendly.
Once Deathwing does make his grand entrance, a lot of players will be racing to level 85 and gearing up via heroics so they might enter the raids and go for a server- or even world-first kill. What about those of us who aren't interested in blowing through the content as fast as humanly possible? What about those of us who aren't going to be leveling as fast as possible?
I myself am torn. Part of me wants to fly over Dun Morogh and take in the scenery, while the money-maker part of me wants to spend the first week or two farming ore. It's a proven fact that people will pay nearly any amount of gold for materials to craft an epic. Many people will be leveling their crafting professions as quickly as they can level. The first few weeks are a goldmine for herbs, ore and leather, depending on your server.
If you're a slower player, what is the first thing you plan on doing once Deathwing finally makes his appearance? Maybe you have a list of things you want to do but you have no idea where to start, and you'll randomly pick something from the list. Are you going to fly throughout the Eastern Kingdoms and Kalimdor, taking in the new scenery?