So I was reading how WDI made plans to put DAK's Countdown to Extinction in DLR's TL from jimhill (http://jimhillmedia.com/article.php?id=1897). Queue was to be in HISTA and ride building in Grand Canyon/ Dinorama area. I rode CtE and glad it didn't come to DLR.
SO, what if instead the dinorama area was rebuilt (and partly underground) to house a Journey to the Center of the Earth type ride. And Grand Canyon is redone to house a Treasure Planet inspired Peter Pan/ E.T. Adventure/ TDS's sub type ride. Could this be made possible?? Just to let you know, I've never been on JTTCOTE, but think it could be done if its rethemed a little. Plus, this wouldn't be an EXACT carbon-copy clone. Additional show scenes could probably use waterfalls, splashing water effects, steam/smoke/fog effects, and fire effects. And the dinos could be part of the Journey ride, but reconfigured. And they will be seen from the trains. The glass on the attraction side would be tinted while the train side would be normal. Not sure if that is possible though. Also there would be a "cold" and "hot" environment in Journey in addition to the original TDS ride. So this kind of covers that effect from Test Track.
EDIT: OR instead of Journey going to the center of the earth, what if the elevators you go in is themed as a transporter/teleportation device to send to an alien planet where you explore its surface and what's inside the planet. Not only do you discover colorful planet life, animal life, and alien landscapes, but you also discover dinosaurs (from the current dinorama). Then around the T-rex volcanic scene, you come face to face with a lava creature (from the original Journey ride).
Entrance & exits where the Space Mountain Fastpass machines are. The Treasure Planet queue leads underground under the backstage roadway area to the show building. JTTCOTE's will have guests board maybe 4 elevators to go underground (similar to Haunted Mansion's stretch room elevator). Then the rest of the queue goes underground under backstage to the show building. Both will have an exit ramp back to the entrance of the attraction. If Space Mountain Fastpass is still needed, they can line those up near HISTA or Pizza Port's outdoor seating. And possibly JTTCOTE's Fastpass Machines as well.
But this walkway may get congested, so maybe return Space Mountain's entrance ramp where the current HISTA is. Then reconfigure that 3D theater's entrance to the left. But still have queue space near/under the SM entrance ramp...
The trains will be able to peek inside these 2 rides. The idea is the trains are "teleported" into outer space/ alien planet and then to the depths of the earth then finally back to Main Street.
Also in the article, it mentioned WDI talked about putting the Grand Canyon items in the Western Expedition ride that never came around. Is there room to put this diaroma in the tunnel between Frontierland and Fantasyland? In fact, I would enclose the Fantasyland theater, so there would probably be more convenience and room to put the Grand Canyon here. If a section of the tunnel is actually also used a backstage road way, then the Grand Canyon can be split in 2 sections with the middle dark to cover up those backstage doors.