They could easily integrate an African themed building to house the show in Africa. I'd build it behind the Tusker House (unseen) loading to the left of the Safari entrance, and exiting through the bar area. The music and show would fit perfectly in Africa.
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They would never, and have never run a show in an active construction area. That is obsurd, unless we are talking about a few wall panels flopped up against the sides of the building, but if we are talking building walls to code laying footers and such, I would think not.
They do have and occationally use curtains drawn across the exit/entrance, which do make the show much better.
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I don't know what my "your first thing" means, but the fact is if the Lion King was to have to close for the construction, then Camp Mickey Minnie would become a dust town. The Pocahantas show is fed and filled by the exiting Lion King show which alway ends 10-20 minutes before the Pocahantas shows.
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Real tree trunks, I sat there Sunday on an edge that had broken off (splintered), felt the wood texture on the seats, felt the cool moistness that wood has in the morning. If they are not real wood, then they are simply an amazing reproduction of wood. And even if they weren't real wood, the ironic conflict is still there.
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Disney spends plenty of money, it's just a matter of where they will spend it next.
Personally I think their priorities should include:
Freshening up Epcot, finding a new way to encourage new Countries to build pavilions (e.g.: multi-culture pavilions with 4 or 5 countries paying for a shared pavilion, sharing an major attraction, stage (offering non-stop alternating entertainment) surrounded by a shaded (or indoor) eating tables.
Replacing the lost live show (Hunchback) at MGM.
Adding the missing part of the park, Beastly Kingdom.
The park was suppose to have animals that were (Dinosaurs), are, and never were (Dragons, Unicorns).