Ahhh yes. Show Biz Is. Forgot it.
Unfortunately as said before, Frontierland Diamond Horseshoe is too small of a stage. Again, no room for that many performers. That show would need a large theater to perform in. And there's nothing else that big. Disney doesn't build large theaters from scratch anymore (Theater in the Wild was a rehab and got enclosed, but was circa 1998). Theater's are big and bulky, take up a LOT of real estate, and contain performers that are not animatronics.
Let me translate. Operations, Costuming, Technicians, Cast, which all take $$$$$$$$$$$$$$$$$$$$$. Large shows are few and far between in the making. Animal Kingdom NEEDED something...so they got Nemo. Studios needed an e-ticket for attendance knowing that the backlot was pretty much gone, they got LMA. If Disney couldn't have gotten away without it, they would have. Epcot has ZERO theatrical entertainment experience during the day (aside from RoE). It's not for guest experience, it's for attendance. When they need something to boost attendance, they add it. Not until.
And as far as the demolition of Galaxy?
My own personal opinion (which will probably be right). There won't be a parking lot, it's in an awkward position back there. And there won't be an attraction for YEARS to come (if any).
However, I MIGHT see it as a relocation for the Outdoor Foods Prep Area....which in turn WOULD free up another single row of parking.
Personally, I think it was an excuse to stop doing Twas.
Consider the first two situations, and tell me which one you might find more acceptable?
(1) "We're sorry, yes the theater is still here, but we've decided to not remount Mickey's Twas the Night Before Christmas, for budgetary purposes (aka we're stingy, and this show costs too much to run). Yes, sorry, we understand you are paying the SAME or MORE than last year."
(2) "We're sorry we will not be presenting Mickey's Twas the Night Before Christmas. That is due to the fact that have torn down the theater prepping that space for a new attraction in the future."
Think about it