I thought they were planning on doing a lagoon show soon (is it dead now?). Regardless, for some reason, I can't see them expanding into the lagoon, lol. It would take a while to build a new land in the lagoon, and it would create quite an eyesore (construction vehicles and what not).
And yes, if Middle Earth comes, I'm expecting a full on land, not one attraction.
I can't see them tearing out World Expo. IF World Expo goes, I'm expecting Tokyo. And please, for the love of Spock, don't take away my MIB!