To my eyes, OTTC is doing fine, considering it's not a classic show with a substantial following beyond musical theater devotees. It was never a colossal hit before, and though Chenoweth has a loyal fan base, she's appeared regularly enough that she is not an event beyond it. That's not to disparage her star power or commitment to B'way, but she returns often enough that she alone won't sell tickets. Just my opinion, but the title doesn't conjure up a show that people can readily get inside. It has no famous hit song around which a TV commercial can be built, and its semi-operatic style doesn't necessarily appeal to a wider audience. So to me, these are respectable numbers, with 97% of the seats filled. It just isn't CABARET.
"I'm a comedian, but in my spare time, things bother me." Garry Shandling