Not really, the story of Budd is just a side story that adds favor to the wowverse and Old Blanchy is the same. It it wonderful to see characters that change and evolve with the game that are not main characters. I would say the reason the story has declined in recent years has more to do with books and comics pushing story arcs that could have been used in the game. If they wanted to they could add a future cavern of time and push the storyline that way but blizz also has to deal with fans that want to see old major characters and not very welcoming to any new ones. Also if you don't mind redoing quest in Felwood there is a very nice quest chain about Illidan there.