Paul also said somewhere above that "no one has ever bought content because it's 4K" or something to that effect. While I know that most who shoot in these higher resolutions aren't delivering at the same resolution, customers absolutely have and do buy content that's specifically 4K. While they really won't see huge differences, the public has been conditioned, already own the displays and are starving for 4K content.
It really is only a matter of time before this is the standard for online delivery.
Paul, if you're at all interested in learning about some of the cameras available for content creators of all types....here's a good look:
And the results...based on the votes and eyes of viewers who likely know what they're looking at
Keep in mind, the Pocket 6K is $2500 and the Arri Alexa Mini is about $30000. The only thing cheap about that camera is the cost.