Yeah, my thought is a Shire and rivendell area in Kidzone, A misty mountains/moria type deal behind the simpsons that would allow tunnels underneath to allow the FFB staff to access backstage while eventually allowing guests to access the empty MIB plot. Then in the empty plot by MIB they could build Mordor, the two towers, the white city, or whatever. they could do it in stages that way. And eventually, if they really wanted they could expand through MIB and into the FFL area.
Never happen, but if a 3rd gate is out, its definitely the best area they have for doing a Full Middle Earth.