I'm not sure about the Empty Stage inside ABC Stage. Also Sounds Dangerous is still in the ABC Sound Studio since 1999. Man It's been 5 years since Doug Live is gone as well as Get Happy with ABC. Now that I hope that Disney Channel will take over the Stage with a live show of Kim Possible, Lizzie McGuire or Disney Channel Live with characters from Disney Channel Originals. As well as Disney Channel Sound Studio will have guests to create their own sound effects to Disney Channel Originals etc... Just like the Monster Sound Show. Probably the ABC attraction just north of Echo Lake will undergo to transform into Disney Channel Stage and Sound Studio in the future.
I hope it helps!
I hope it helps!