This will change as wireless network technology improves. Certain carriers, such as Verizon, already offer wireless Internet service. New technologies will soon (in about 5 years of time) enable wide area (metropolitan level) high speed networking. The cost to set up a metropolitan wireless network is significantly less than that of a wired network. It is also possible to have multiple carriers offering competing services using wireless technology.
Perhaps even more importantly, wireless Internet access also means mobility. Combined with thin-client concepts, it will soon be possible to take a PC with you, and access content via the Internet no matter where you go (within the service area).