Are 1080p Moniters, TVs, Phones etc. extinct already.

[ArnoldRimmer]

There's just no reason to buy 4K yet, because there's no content. The situation is just like 3DTV - just even much worse:

- current 4K TVs are still crap, because to properly get 4K content to your TV you need HDMI 2.0, which was introduced just three months ago. I don't know of any current 4K model that already uses this new standard, all the ones I checked were using HDMI 1.4 - which is technically capable of displaying 4K content, but only at 24 frames per second. So people who buy a 4K TV right now will buy a model that will be technically outdated in a few months

- BluRay was able to handle 3DTV, so people can simply walk into a store and buy a disc with 3D content. but BluRay cannot handle anything beyond 1080p - so there's not even a disc standard yet that could be used for providing 4K content. And even if such a standard would be introduced today, it would take years to get a somewhat reasonable adoption rate.

Video game consoles will not use 4K resolution anytime soon. It's just not worth it. They'd need 4 times the graphics processing power of 1080p resolutions, and yet, most people would hardly see any difference in their personal TV setup.
Remember that at a time when 4K TVs were already available and affordable, Microsoft still decided to rather go for higher graphics quality at 720p resolution rather than lower graphics quality at 1080p resolution. And as much as I like to make fun of that: that was a wise decision.

In practice, it will be like 3DTV: In a few years, everyone will be buying TVs with 4K resolution, even those who are not really interested in the technology. Just like people nowadays are pretty much all buying 3D capable TVs. Because once the price difference to models without these features is neglectable, there's just no reason for buyers to miss out on these features.