James, you could be very well correct, especially the comments about commercial content but .... I get the feeling we will see more and more Camcorders with higher resolutions just as we do now with Photography.
For example what is the resolution of your Still Camera? Even the terrible setups on phones run at 10mp+, yet I don't have a single monitor higher than 2mp in the house, and if I print out a photo (rare these days) I've still got pixels being discarded printing up to A4.
I think the marketing of this format as "4K" is terrible, for a start the resolution is 3840 x 2160 so is twice the horizontal and vertical resolution or "4x" the resolution of the current HD "1920x1080" spec. We have always quoted Video resolutions by the number of lines (vertical resolution), 576, 720, 1080 etc, but now with 2K / 4K it is using horizontal resolution!. I'd prefer if they marketed it as 8.3MP (16:9) as consumers are already fascinated by the number of mega pixels their devices have. More is better right?
So I see a couple of benefits of these "4K" camcorders even if you only plan to produce to 1920x1080 or even lower videos
1) You can pull far better quality stills off a video stream (eg 8mp vs 2mp) so it continues to help convergence between video and still photography
2) You can now crop/zoom in on your video without the need for scaling and the visible artefacts this brings.
And how could I refuse Dafydd's kind offer... the only problem is it could be a while.... as I like higher FPS over Resolution so I'll be giving this generation a skip as I wait for the 50/60p versions!
PD 64 Bit-Win10 64 Bit-32GB RAM-80TB HDD
Sony FX6 - 500Mbps 4k/50p AVC-I HLG
Canon XF400 - 150Mbps 4k/50p AVC
GoPro Hero6 Black
Pana HS700-28Mbps 1080/50p AVC (High@L4.2)
Canon HV20-HDV 25Mbps 16:9 1440x1080/25p MPEG