This is talking about leading edge tech heavy users. The difference between being able to get 24Mbps at AT&T ( http://www.att.com/u-verse/explore/internet-landing.jsp ) and 50Mbps from Verizon ( Link is down at the time of posting: http://www22.verizon.com/Residential/FiOSInternet/Plans/Plan... ) or a cable company doesn't matter to 99% of the population. By the time the "average user" wants higher speed the providers will spend the capital to roll out the infrastructure.
Look at the numbers provided by Internet World Stats for the USA for 2010 ( http://www.internetworldstats.com/am/us.htm ) and you'll see that only a third of the users are even on broadband at all...
People in the USA: 310,232,863
People in the USA on the Internet: 239,893,600
People in the USA on the Internet with broadband: 85,287,100
This isn't due to the fact they have no option to get cable/DSL/Satellite -- it is that their dial-up "works just fine for me". These are fixed line stats, not mobile -- so this may show that many are skipping fixed line broadband and going full mobile.