No one can say that 4K is worse then 1080p but I still do not think that it will play any role in picture quality on <70" screens. Movies played on projectors(>70") will without a doubt be the place where 4K could make a difference.
I still thinks that 4K have a VARY long way to go, yes it might be the standard of TV sets launched in 2016 but the media will still be a big problem. Lets just look at today media, the only way to get BEST POSSIBLE picture qulity are from a blu-ray disc (x264 that you find on internet dont stand a chance) . When was blu-ray released? 2003? 2006? for about 8 years ago, how good does blu-ray sell today? Some stores here in Sweden states that thay are selling 50% DVD(SD) and 50% Blu-ray(HD), there is still a lot of series that are never released on blu-ray. How big is the qulity change from SD to HD? Huge, right? New hardware TV and blu-rays was needed to be able to play. Some users bought HD Ready(720p) and was happy with that.
So what does it take for 4K to get at least the same market as blu-ray? New hardware is required again but how big is really the diffrence at regular comsumer sized TV(40-50")? Are the diffrence anywhere near SD VS HD at this sizes? And how will the media look like? Will it be Blu-ray discs?
Some says that Internet will be the main source for 4K and that may be true, but will it really beat the qulity of a blu-ray disc? What will look best? 4K over internet or a full blu-ray disc(1080p)?
It would be great of the new 4K format could be used for 1080p media, that could result int full blu-ray disc qulity at a size that we still can pass over internet without problem.