These speeds are already available. I've had 50Mbps/15Mbps from Comcast for over a year, for about $100/month -- and I actually get those speeds so long as the server with the content is willing. Dual-stack support is soon as well, so I'll have an IPv6 address.
In the next week or so, my downstream will be increasing to 105Mbps at no additional charge[1]. In some markets (mine included) Comcast will be offering 305Mbps downstream service (granted at $300/mo), which is 90% of the bandwidth the DOCSIS 3.0 specification would allow over 8 channels.
Granted, on the opposite end we have Verizon now trying to slowly kill their DSL service and replace it with LTE. [2]
From the ISP perspective it's actually getting easier to accommodate these faster speeds. Very few customers can actually saturate a 100Mbit/sec connection for more than a few minutes. I suspect the usage on a 305Mbit/sec package would be nearly identical to the 50 or 100Mbit package for most customers. Once we got past this 15-20Mbit/sec mark usage stays about the same as you scale speeds upwards. The old model of oversubscription works again. There's a lot of gloom & doom about US broadband but the reality is we're actually in pretty good shape now that most cable operators have deployed DOCSIS3 equipment.
Does that include cable? I pay 105$ a month for 75/35 + cable w/HD DVR from Verizon FIOS which might make Comcast better after that upgrade.
Or, if it's just internet then 150/75 is 99$ and 300/65 Mbps is 200$/month from FIOS which would make Comcast a little behind but still reasonable alternative. Which is a lot better than the last time I compared them.
With the most basic of TV service, taxes, fees, etc. my total bill comes to about $116.81/mo. If I punted the TV service, my savings would be about $4/mo. I don't bother with TV service because to get the one channel I want, the required pre-reqs and equipment would double my bill.
Regarding Verizon, I'd love to have FiOS, but they won't deploy in Boston without major tax breaks, which Boston refuses to offer. FiOS is great if it's available, but it's not in most markets. There aren't many other options in the continental US where you can get 100Mbps service for ~$100/mo if FiOS is unavailable (and for most of the US, that's the case).
In the next week or so, my downstream will be increasing to 105Mbps at no additional charge[1]. In some markets (mine included) Comcast will be offering 305Mbps downstream service (granted at $300/mo), which is 90% of the bandwidth the DOCSIS 3.0 specification would allow over 8 channels.
Granted, on the opposite end we have Verizon now trying to slowly kill their DSL service and replace it with LTE. [2]
[1] http://arstechnica.com/information-technology/2012/07/comcas...
[2] http://arstechnica.com/tech-policy/2012/07/op-ed-verizon-wil...