We'll see about that (with respect to pixel density and efficiency). I'm typing this on a 4k xps 15, and while the display is great, the battery cost is extreme. There would be no meaningful advantage in an 8k-display of the same form factor, so there is far, far less incentive for manufacturers to race to 8k.

there will be 8k tvs, sure, but lets be real - the step to 1080p was massive, the step to 4k already couldn't fit in those shoes.