I am NOT backing up the cable companies on this, BUT, ONE of the reasons they needed to dump the analog service is because they needed the bandwidth for all the extra channels the ESPN, Fox Sports (to name a very few), present to the cable companies as a take it or leave it package. Add a hundred movie channels or so, add who knows how many On-Demand slots in the system, plus ultra wide full duplex internet (if you pay for it), and its easy to see where all the bandwidth went.
(edit: iphone spellin)