The perfect show would be one with minimal characters, minimal scenery, and running continuously for 8 to 10 hours per day.2000 people every 90 min isn't that much and wouldn't do that much for crowd levels. That equates to about 1300/hr, and it wouldn't fill the whole 90 minutes (performers need time to regroup, break, etc., logistics of loading/unloading). I don't think the theater was the answer to the crowd problems. Would be much better to build a solid D-ticket ride (very popular, but not something that would serve as a specific draw to the park) that could serve 2000+ guests per hour. That would go a long way to helping park capacity.
I call it Waiting for Godawrsh, where Mickey encounters Goofy sitting on a non-existent park bench, reflecting on the absurdity of the theme park character experience. In a nod to the Carousel of Progress, the audience seats rotate in six segments so people can swap out as two segments pass by the entrance and exit of the theater.
This has the added advantage of subliminally building demand for all those Trivial Pursuit - Disney Edition games they have in the warehouses.