Comcast is talking about "not decreasing" the availability of content. Some businesses can afford to pay to use already-paid-for infrastructure. Others are out of luck, and their content is not fully accessible. If Comcast did not exist, current users would not be able to request content, but the market could provide a solution in an alternate ISP. With Comcast the market cannot provide a solution, because it is actively being suppressed by Comcast.