Seriously doubt they will ever expand the building EVER.
Mainly because to left (As you look at the entrance) youve got the backlot Express/Entrance (And OR Exits) for Parades, to the right is the garbage area for Star Tours and Pizza Planet. Behind the attraction....oy, put it this way, take a backlot tram car and place it between the fence and the building (Like have the front facing the building) and you barely (And I do mean BARELY) have enough room left, not to mention, on the other side of the fence is the main parking entrance for the Studios. Add to that back area, you've got the area for the Indiana Jones Stunt Crew and their storage areas, and the parade cars building....
I think at the most we'll see either:
-An updated film
-Resoration of the current film (With the perks I mentioned earlier)
-Maybe a gut of the building and rebuild everything ( I can see them adding a third floor (The ride itself is on the second) to make room for a larger SIM or more cars.
But other than that really, I wouldn't expect the Leading Company for all your travel needs to get that much changed.
I know that area like the back of my hand, I used to work over at Star Tours before ISTC came in. And Im not saying this to build more on the fact that this is basically what it boils down too. It could happen, they might eventually decide to expand the area.
But another thing you have to look at is that long time and long fabled Indiana Jones Epic Stunt Spectacular being removed for the Indy Adventure, that building is pretty big when you add in EVERYTHING for it.
*Im trying not to go off subject but*
Another thing on the Indy switch out. This is for a lot of you who aren't CMs, and this is totally off the record as far as my defence goes for the show.
One of the MAIN areas for deliveries of many things, merchindise, new costumes, ect., the entrance is directly behind the Stunt Show. Not to mention the Cast Entrance/Costume department. On top of this, the perimeter road runs right behind the stunt show as well, which is also used for the parade cars and pratically everything that goes on backstage.
So with that in mind, this is another reason why I would highly doubt the introduction of the attraction down here simply because of geography and room, they simply dont have enough of it with the surrounding areas, not to mention one of the most vital areas to Studio CMs rest right behind the area.
You want to know how close the show is to the Cast Area. Seriously, with just the spikes shooting up, you can actually feel/see the walls vibrate from the sound effect of them shooting up. And the truck explosion during "Cairo Encounter"? Im not even going there.....Its not earth shattering but dang that thing rattles certain areas back there big time.