Unfortunately I don't think a full-on Bikini Bottom expansion is in the near future. It seems like they tried to incorporate as much from Spongebob as they possibly could into that one store. It would be odd having a full size Pineapple outside with a miniature in the store. But, if the expansion did happen couldn't they always just relocate the ET entrance to Hollywood (near Horror Makeup Show) and put some sort of SB/Nickelodeon facade over the ET building?