4k is being pushed down consumers throats because television sales are dwindling. 3D was supposed to be the next thing to put money in the pockets of the television industry, but it failed miserably. They've now moved on to 4k (UHD) as their next transition in television production. Everybody THINKS they want 4k, because of the marketing, but they haven't actually had to deal with 4k file sizes, the lack of ecosystem to support 4k, and the barely perceivable difference when casually watching 4k content.
As a professional video producer for 19 years, transitioning from analog SD to digital SD to digital 16x9 to HD, this is the most trivial transition yet. At NAB this year they were already pushing 8k hard, which is going to be the next step to try and pull more money out of consumers. I've got a few professional level ($35,000 each) 4k cameras, and they're really only good for shooting a wide shot and then cropping multiple HD images out of the one 4k shot.