Two announcements made on Monday promise to further alter the way people watch television, if not change the medium's business model altogether. CBS has inked a deal to make four of its top shows  CSI, Survivor, NCIS and The Amazing Race available for viewing on Comcast's on-demand video service, for a price of $0.99 per episode. Similarly, NBC Universal has teamed with DirecTV to make many of its programs available after their original broadcast via a new interactive digital-video recorder. But will any of this stop my VCR from flashing "12:00"?