Nickelodeon, of course, will be doing plenty of worrying about the bottom line. And everyone involved in this costly musical is clearly aware of the most dangerous perception — that this will be a big show with a strictly kiddie aesthetic. Kids, it is likely, will want to come anyway, as will the hardcore fans of the show, albeit with some trepidation. Success on Broadway will hinge more on convincing audiences that this is a family show, sure, but not just for families. You only have to look at the list of invited composers to admire the attempts at snagging multiple demographics. Still, the show will live or die based on its ability to reach the huge group of people whose knowledge of "SpongeBob SquarePants" is limited to those two alliteratively effective words.