[citation][nom]phantomferrari[/nom]First off, most ISP's do run on a fiber optic network. Just not all of them go to the house/premises. Second, The newer iterations of DOCSIS can support 1Gbps, So the excuse that ISP's will have to spend a great deal of money to make 1Gbps work wont fly. The reason why there isn't a big push for 1Gbps is there is no need for it yet. However, with more and more companies push digital distribution (at least video games) and with the most likely rise of 4K video (which Netflix and others will want to stream) there will be a greater need to have 1Gbps internet connections[/citation]
I realize that, running it to the house is another animal, and ya sure current DOCSIS could do gigabit connections but the amount of bonded channels needed would wither at the limited capacity of there coaxial network. Under the current 6Mhz wide 256 QAM modulation per channel, conservatively I would say you could get a maximum of 25Mbps/per channel. So that would require 40 6Mhz wide channels a total of 240Mhz on a network that probably doesn't even surpass a max frequency of 900Mhz! That's a lot of real estate