A) Casa and Performing Arts Ft. Worth announced their season a hell of a long time before DSM did. Casa is no longer presenting tours with Performing Arts Ft. Worth. The two split starting this season, hence the move for Casa back to the Old Dome on Lancaster.
B) DSM needs to go back to doing self produced shows with "big" names, like they did in the 60s and 70s. That's how they earned the title "America's foremost summer theatre."
C) The new competitor mentioned actually has done pretty poor business. Everything they do ends up discounted, because nobody wants to pay $65 for a sunday matinee, for the last two rows of a fourth balcony, and then the additional fees plus $15 for parking. South Pacific barely sold, Avenue Q certainly didn't (hell, Bass Hall, which is smaller, had to sell the first 10 rows of the orchestra for $10 and still didn't sell out) and the Grinch didn't sell very well either. (No one could afford it)
http://www.youtube.com/huskcharmer