Perhaps if my eyes were rotated 90 degrees on my forehead, I’d appreciate vertical images, but since they are situated to binocularly scan a horizon, I’d rather stick with wide formats, thank you. Extremely old movies were square and you could sometimes notice dark corners due to the circular aspect of light that had entered the lens failing to reach the edges of the negative. Films gradually got wider and wider. That’s generally been a good thing, though I think we’ve passed a maximum for easy enjoyment without needing to move your head to track motion on theater screens.

I might back up to 16x9, but I certainly don’t want to see 6x13.