Realistically, Full HD feels like a wall for high-definition video.

Technically, 8K is already complete, and it was even used for broadcasting during the 2012 London Olympics.
Therefore, I believe the issue with high-definition video is not a matter of technology, but a matter of reality.
Even if you buy a 4K TV, it only costs a few hundred dollars, but the problem isn't the technology; to actually experience it,
you need a large screen. However, the issues regarding space and delivery for a 150-inch TV remain unresolved.
Furthermore, while most movies are in 4K, broadcasting is limited to Full HD due to transmission issues,
and even OTT services like Netflix or Disney have bitrate problems.
That is why, looking at YouTube, most mainstream content is being produced in Full HD.
Of course, the day will come when 4K becomes the standard, but I believe it will be much further in the future than expected.
This means the day we solve the practical issues, rather than the technological ones, is still a long way off.