I think a good idea would be to get rid of the Indy show. (I love it, but its getting old and corny...) Replace that with the Indy rollercoaster from Paris. Doesnt have to be identical but similar. If there is an expansion of something like"LucasLand" then who knows though.
I would personally rather see a water ride. its something the park is lacking and its the only property that really fits the concept well. more likely then not though indy won't be a part of WDW any more outside of the great movie ride after the stunt show is removed.
I have an idea about Monsters Inc. More than a ride, but less than a land. Im sorry i forgot than name of the place but it would be the building that they work in. It would have a dark ride, thrill ride, shop, and restaurant. Thats the whole thing. The dark ride would be similar to the one at DCA. And the thrill ride would be something to do with the doors that always fly around the building. I think this could work because it isnt huge. Also, this could take the place of bugs land at dca
The Monsters Inc coaster was originally intended for DHS next to TSMM but for some reason TDO turned it down.