could you tell us what actually happens to the Dark World after AST? I doubt there are credits to that game, but do we maybe see the overworld palette changing? I hope not..
There is a credits sequence, but it's not a landscape. Basically once you've defeated Ganon you have a short while (13 minutes at most) to fool around, which you can do in the Dark World or Light World indifferently. After that, you'll be escorted to the Master Sword pedestal by Zelda and Sahasrahla, and the game will end.
Personally, I'm one of those who assume the Dark World comes into being when a evil heart seizes the Triforce, so its return in AST puzzles me quite a bit. But then so it did in OoX too.