content: 4k really lowers the need for anti-aliasing in games, but not completely. 8k would get rid of the need altogether.  Also, as you get to higher resolution, you're increasing pixel density. So by the time 8k screens become more common, that means we're getting tinier and tinier pixels, which would help resolutions for mobile devices and VR goggles (which REALLY need better pixel sizes to negate the "screen door effect" of seeing individual pixels when they are so close to your eyes). So, yeah, there is a point for 4k/8k resolution. Pixel density.