Unless you're planning on opening your own IMAX theatre (12k horizontal) - I just don't see the point...
I think its fair to consider large screens. I have a 75in 4k and it's beautiful but when I go into the bedroom and watch the 55in 1080p Sammy that's much closer to me, the experience is comparable. My ideal lounge size would be around 100in for my viewing range, at a guess by that size there would be noticeable image quality reduction at 4k. So I do think that on this upper end of tv sizes there's some use for 8 and 16k. But beyond that I don't see it. I'm not sure what point there would be in 32k or above outside of huge cinemas.
So what then lol