TV sitcoms like "30 Rock" with Alec Baldwin have an uncertain future.
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The void you're looking at on your DVR is the sitcom landscape post-"30 Rock." When Tina Fey's bright, bouncy, irreverent showbiz sendup aired its last episode Thursday night, a light (Kenneth's toothy grin?) went out in broadcast television. With "30 Rock" leaving the air, the sitcom again finds itself at a crossroads.