NHK is correct it does make more business sense in upgrading to 8k, than doing 4k now and 8K in the future. This would apply to broadcasters as well as consumers. An 8K flat panel or projector can also change resolution to support 4k content. Recording 8k is the problem, since the broadcaster will have to use the latest technology to do that. Here is the data rates for 4k and 8K video. A broadcaster has to capture in RAW format.http://nofilmschool.com/2012/05/nhk-finally-shrunk-8k-camera-data-rates/
Here are the types of data rates we are dealing with. First, the 4K RAW (cinema aspect ratio of 1.89) data rates
4K RAW (4096 x 2160), 24fps, 10-bit: 253.125 Megabytes per second – 15.2 Gigabytes per minute – 911.3 Gigabytes per hour
4K RAW (4096 x 2160), 24fps, 12-bit: 303.75 Megabytes per second – 18.2 Gigabytes per minute – 1.093 Terabytes per hour
4K RAW (4096 x 2160), 24fps, 16-bit: 405.00 Megabytes per second – 24.3 Gigabytes per minute – 1.46 Terabytes per hour
Next, we look at 8K RAW data rates, using a similar 1.89 aspect ratio for comparison (even though the NHK camera is 1.78 at 7680 x 4320):
8K RAW (8192 x 4320), 24fps, 10-bit: 1.012 Gigabytes per second – 60.75 Gigabytes per minute – 3.645 Terabytes per hour
8K RAW (8192 x 4320), 24fps, 12-bit: 1.215 Gigabytes per second – 72.9 Gigabytes per minute – 4.374 Terabytes per hour
8K RAW (8192 x 4320), 24fps, 16-bit: 1.620 Gigabytes per second – 97.2 Gigabytes per minute – 5.832 Terabytes per hour
If 48fps becomes the new standard, then you need a much larger SSD RAID array. http://nofilmschool.com/2012/04/peter-jackson-shows-10-minutes-the-hobbit/
Personally, I rather buy an 8k flat panel or projector than going with 4k now. I don't like to upgrade every few years. The audio is another problem, since it requires at least 22.2 audio setup or 25.3 from Dolby. I have literally redesign the my main room for the audio and video. Hollywood doesn't have 8K content at the moment, but they do have 4k content.
4K and 8k Content can be delivered via Internet2, since it is being upgraded now. I suspect that will be the new optical fiber to the home, because it is rather costly to develop an all fiber network for research only. Internet2 was designed to be upgradeable, unlike the current Internet which is basically 1990 technology.
Internet2 is currently 100GE, but IEEE has 400GE upgraded planned and I suspect 1TBE soon. http://www.internet2.edu/network/
Each state in the USA has companies that are install fiber now. My state recently has asked business to connect to Internet2 to help pay for the costs of this highspeed highway, so I suspect that it will need to be funded soon for consumers as well. In the USA, there is a National Broadband plan, and Internet2 is doing the research for that plan.
Satellite is another option, and the spec DVB-S2 is free to air spec. I just have to do more research on satellite technology. I do know that Hughes has launched Jupiter, which primary purpose is for Internet. http://www.hughes.com/PRODUCTSANDTECHNOLOGY/JUPITER/Pages/default.aspx
The satellite has huge bandwith potential. It is Ka and over 100Gb/sec. It has the DVB-S2 spec too. Directv used the other Spaceway satellites for HDTV, instead of broadband. I just don't see the demand for internet on satellite since there other solutions, so perhaps this satellite will be used for 4k and 8k in the future. The national broadband plan has funding for rural areas in the USA. Rural towns are getting upgraded to fiber.