4K will most likely remain the standard for the foreseeable future.
For gaming, a significant number of AAA games cannot even reach 1080p, let alone 1440 or 4K, and require upscaling to hit higher resolution targets (to mixed results). GPU horsepower is better off being used doing other things (like RT). It's about the overall quality of the image being generated, not the raw number of pixels rendered. In fact, I think the most commonly used monitors are still 1080p.
For movies, the typical home viewing distance would not see much benefit from 8K. You'd need a very large screen (85"+) to notice any difference, and as the screen size increases, the cost goes up exponentially. Very few modern films are even completed at resolutions over 4K. I think one of the only exceptions is Christopher Nolan, who is the only filmmaker that still uses a photochemical process to develop his films, which retains the negative's original image quality. True IMAX and 70mm can be developed at resolutions that approximate 16K, but the vast majority of IMAX films are completed at merely 2K (like nearly all MCU movies).
Physical media is on the way out, so there's almost zero chance of a new format being created. And streaming video at 8K would require significantly more data to be transferred, and I'm not sure that most homes would have internet fast enough to handle it.
To put it more succinctly, I think 4K will remain the standard for at least the next ten years, at minimum. And the next generation of consoles will also still be 4K.
