Old World Delves?

Was just wondering about ways to incorporate the entire world of Azeroth back into current content and thought of this. Sky-riding Races are nice, but they don't exactly feel repeatable, at least for me. I would probably start with places near portals like Old Dalaran in Northrend or either Capital City to make the travel time a bit easier but really eventually bring 1 delve minimum to each zone so people can have a short experience that gives players a taste of what the zone's about. I would love a Uldum or Tanaris one personally.