Agreed about Olympus Coliseum it's been used in like every game only way I can truly see many worlds returning is if they go outside the box. Such as letting us go between towns in Hercules world or in Agrabah they go to different towns as well. If you remember in the shows from the 90's they had a lot of other cities included.
Olympus coliseum hasnt been rebuilt yet, so i dont think we're done with it XD