I quit over the summer, and found out about this fairly recently.
I'm honestly not sure what I think. Revamping the original world sounds like a good plan to me and in my opinion could really rejuvenate things. At the same time, going back to the old world and playing around with things that are completely untouched (like the old dragons) for fun will probably go away, and that makes me sad.
I've been considering going back, but I'm having a hard time making the decision. I'm so behind in raid content it makes me sad. Maybe I'll go back and make a new character...