Increasingly, imposed concepts -- here the circus motif -- which once marked shows as stylistic and cutting edge -- seem to produce charges of pretentiousness and over-thinking at best and cliche-ridden at worst. Everything in musicals now must be framed as metaphor, the sustaining of which requires arch adherence to an overly familiar set of devices, indeed gimmicks (either a master of ceremonies or a chorus on hand to tell us what we're seeing and why). It's almost as if the genre must go full circle, to find new-slash-old-fashioned ways to tell a story that don't hammer theme and take-aways for us. It's become daring these days to start a show with a scene, the 4th wall not broken, and the characters singing to one another. The new high concept might be no concept.
"I'm a comedian, but in my spare time, things bother me." Garry Shandling