The trouble with 4K (P3P) is that the masses aren't ready for it yet- how many of us have a 4K tv or a 4K compatible computer?? By the time the 4K is mainstream the P3P will be obsolete!
However, it's the video that we are talking about and 4k video won't be obsolete.... 1080 video will be. I'm not saying 1080 video is not good... I'm pointing out why some people are filming on 4k at this time.