4K has not been out long enough and IMHO they need to slow down! There is not enough 4K content and they want to crank out 8K displays already, enough already! And as far as video projectors go there are not alot of actual native 4K projectors out there so how long will it take them to come out with native 8K projectors? And I will not be replacing any 4K content with 8K versions! I see native 8K being good for the cinemas but then who is going to start shooting in 8K resolution and even try to render special effects in 8K, do not see it happening. Where is this all going to stop? I might be willing to get an 8K display but nothing under 100" and the price needs to be reasonable.
Not only is there no current 8K content, there's also no back catalogue. The only stuff that could even remotely take advantage of 8K are films shot in IMAX 15/70 and a few dozen 65mm productions.