"A new report using an innovative approach to broadband data finds that the percentage of households in the United States that have adopted high-speed internet services is 72.9 percent", according to a post on BroadbandCensus.com
If the Penetration of Broadband is over 70% -- that doesn't leave room for growth. Why? Because about 20-25% of households do not have a computer.
That also means that it is almost certainly a plain game of take-away. In other words, to get a customer you have to take it away from another carrier. This will become bloody in the cable-vs-telco triple play battle, but just as likely to be bloody in the B2B space.
There will be a trend to sell on price, but Value must be Sold.