The big country acts are selling out arenas that seat 18,000+, I do not ever see Grand Palace doing this. But maybe bigger isn't what is needed?
In Tulsa, in addition to an 18,000 seat arena, we have Cain's Ballroom, Brady, Spirit Bank Center, several Casino's, the PAC 's in Tulsa and Broken Arrow, and the Joint. The Joint seats about 3,000 and is always hosting events...Joan Jett, Dolly Parton, Hall and Oates., Duran Duran...these are not your top acts, but one that could fill a theater of 3000.
Maybe remodel a part of the complex into a "Toby Keith's Bar and Grill" and attach a new hotel or other attraction to the complex as well. Then remodel the theater into a 3000 seat facility and focus on bringing that mid level artist to Branson.
I'm Not real familiar with the theaters in Branson, but there seems to be some other good size venues vacant as well. So, maybe it might be best to just start over.
Jay