Comcast nor any other HFC have any plans on rolling out FTTH on any scale in the foreseeable future. DOCSIS 3.1 will be their upgrade path. Comcast simply had no choice for their 300Mbps plan. 3.1 can provide up to 10Gbps down.
There is absolutely no way that cable companies are going to throw away their investment in DOCSIS 3.0 that will be upgradeable on the CMTS side to DOCSIS 3.1 without much issue.
If they choose to also run FTTH where they can, then that is a good plan. But it would be a stupid plan to not also go to DOCSIS 3.1 to provide 1gig without having to run fiber to every house where they already have copper.
DOCSIS 3.1 is aiming for 10 / 1 Gbit/s. This is not per customer speed, which is often quoted here, but rather a best case scenario using full spectrum. (not really reality ...)
DOCSIS 3.0 can easily provide 300 megs given enough channels are free, but that is the problem. No carrier has the free spectrum, thus Comcast was forced to Fiber even though 3.0 can easily pass 300 megs.
DOCSIS 3.1 aims to provide 50% more efficiency out of existing spectrum, which ultimately relates to 50% more bandwidth for the end user.
Translation: 300 megs might be doable over copper with 3.1 without concerns for node overloading.
They don't have DOCSIS 3.1 yet. It's specifically designed for gig symmetrical. It may not reach that due to the amount of capacity used up by gig symmetrical in terms of mhz, but it will definitely bring them into direct competition with FTTH packages, even full gigabit.
DOCSIS 3.1 also comes with the possibility of pushing the system to 1.2ghz. With double the spectral efficiency, D3.1 can do over 1gbps per 100mhz given to it. With MPEG-4 and higher mhz plants, 1gbps service is not unrealistic at all.
Comcast currently has 304 mbps theoretical, and they offer 100mbps. If they get to 2gbps theoretical, what stops them from doing a gig? No one can actually utilize the full gig anyways, so the ability to share bandwidth and manage the shared bandwidth will get them to a gig without too hard of an upgrade path.
WHAT? How does no caps harm internet progress???!?!?!?!!??
You have to look at how much bandwidth one person can actually use, and it's nowhere close to a gig. When you only have 38mbps or 304mbps, you can't have one subscriber provisioned anywhere near that. However, with gig, because there is so much bandwidth, if you manage it correctly, you could have it way oversubscribed, and still deliver incredible speeds to the end user.
That's very interesting if the case. Most thought Google was using Active Ethernet, but this suggests it may be a non standard GPON hybrid. Unusual for Google to use non-standard tech if the case, unless they are planning to submit it as a potential standard.
No. They could offer a whole neighborhood gig symmetric, only one house at a time could use it. And likely, no one would notice that it's totally oversubscribed, as no one uses that much bandwidth anyways.