You know how 4K TV demos in stores are mostly still camera shots? That's because in motion (and games are mostly in motion) you can't tell any difference whatsoever.
I think 4K is stupid, and I also think big TVs are stupid so it kinda goes hand in hand. You can improve the picture by a large margin just by learning how to properly set up the TV and your devices.
It's easy to say 4K is stupid now, but it will be the standard eventually. Imagine saying "oh yeah, color television is nice, but I prefer my movies being black and white".