I've suggested this before: Convert the Streets of America into Monstropolis. It could be done easily, keep the same layout and just replace the cardboard flats with similar "urban" images but with Monsters pocking out of windows and monstrous puns on signs. Use the Premiere Theater to house a relocated Laugh Floor show from MK (which doesn't fit in TL anyway). Change Mama Melrose to "Harryhausen's", being an Asian/Sushi theme. Replace HISTK with a Monster's, Inc dark ride -- the door coaster or something like the one at DCA or Hide and go Seek from Tokyo.
This Monstropolis area could then easily still be used to host the Osborne Lights.