The battle for the future of digital TV according to Alvy is between The Grand Aliance ATC ("the forces of analog bits") and the DTV team who feel "digital bits are more powerfull". Basicaly the digital folk feel that bits are bits and that it is folly to spec the video format, much better to make video formats self describing and flexible.
Alvy has a wonderful web page, Digital Bits Are Better than Analog Bits, which I encourage anyone interested to visit (instead of my trying to sumarize the talk from my notes). Please contact me if you have any questions or comments on this review.