Four problems
The reasons for slow TV sales are:
- most people who want one have bought a new TV relatively recently, and don't believe the endless hype about newer, supposedly better technologies
- the Register published a technical article a while back, clearly demonstrating that higher pixel resolution has little effect on perceived image quality, unless displaying mainly static images. This is due to the way the human eye/brain combination interprets moving objects. Frame rates are much more significant, so for any given bandwidth, less pixel density and more frames per second will always deliver a subjectively better picture. 4K is nothing but a marketing gimmick intended to appeal to the ignorant, not that that in itself is proof it won't work.
- fewer people are watching TV anyway, hence they don't want to buy one. Content is increasingly poor, and no amount of extra bling will polish the turd.