I get what you are saying. And 8k and above for stills is great, but I just saw my first 4k footage ever. To say it was amazing is an understatement. To say that the world will change when the public sees what they have been missing with current digital cinema technology is a statement of fact. If the cameras stay ahead of the curve and the projectors follow a few years after we will get to 8k eventually. However to sit around and wait for it to happen is a little silly.
Whatever you do- if you have not seen a 4k projection you need to go to a screening. You will be pissed you ever bought a ticket to a 2k movie.