THERE WAS A TIME, not long ago, when primetime television was populated by famous people. Someone appearing on TV meant that they’d likely worked their way up through the ranks: doing school plays, regional theater, and embarrassing commercials, until finally, they honed their skills, perfected their craft, and slept with the lecherous casting director who’d cause them to become obscenely wealthy and loved by millions. These days, however, television isn’t so much about being famous, as it is about auditioning to become famous. With televised tryouts being the entire point of such shows, aspirants of fame, even in failure, still become quasi-famous by default. There are nights when one can tune into network programming and see nothing but wall-to-wall talent shows. In just the past season, there’s been the Debbie Allen-hosted “Fame,” a creaky brand extension of the early ’80s incarnation in which Cocoa, Bruno, and the rest of the leg-warmer wearing cast would break into song at the slightest provocation. Then there is “American Juniors,” in which the cloying, over-rouged Jon Benets of today strive to become the cloying, overexposed Celine Dions of tomorrow.