Unfortunately, even making the building look like a soundstage would not make it attractive. Placing this building in the center of the area the way they did makes it extremely obtrusive. Almost all of Disney's rides are built inside these warehouse type buildings, but they are placed on the outer edges of the parks behind facades so that you can not tell. Kind of like Skull Mountain, although I think they did a very poor job on that facade.
For those of you that have asked, I was in the "Red , White, and Blue Review", the first year. That brings up another issue, why aren't there any shows at the park anymore? There used to be shows in the Showcase Theatre, the Bandstand on the Lake, a Character show, the Dolphin show, and a diving show. If you really want to attract families, it seems to me you have to offer the adults something to do.
The last time I was in the Showcase Theatre they were showing The Wizard of Oz. Who the heck wants to go to a theme park and watch a movie? The past few years I've only made it up to the park during Fright Fest and have seen the Halloween shows.
I understand there is a parade, but a park that big really should have entertainment other than rides if they want to attract families.